diff --git a/lv_objx/lv_bar.c b/lv_objx/lv_bar.c
index cc0e0f81ed..ace236e28a 100644
--- a/lv_objx/lv_bar.c
+++ b/lv_objx/lv_bar.c
@@ -28,11 +28,13 @@
  *  STATIC PROTOTYPES
  **********************/
 static bool lv_bar_design(lv_obj_t * bar, const area_t * mask, lv_design_mode_t mode);
+static lv_res_t lv_bar_signal(lv_obj_t * bar, lv_signal_t sign, void * param);
 
 /**********************
  *  STATIC VARIABLES
  **********************/
 static lv_design_func_t ancestor_design_f;
+static lv_signal_func_t ancestor_signal;
 
 /**********************
  *      MACROS
@@ -58,6 +60,9 @@ lv_obj_t * lv_bar_create(lv_obj_t * par, lv_obj_t * copy)
     lv_obj_t * new_bar = lv_obj_create(par, copy);
     dm_assert(new_bar);
 
+    if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_bar);
+    if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_bar);
+
     /*Allocate the object type specific extended data*/
     lv_bar_ext_t * ext = lv_obj_allocate_ext_attr(new_bar, sizeof(lv_bar_ext_t));
     dm_assert(ext);
@@ -66,10 +71,6 @@ lv_obj_t * lv_bar_create(lv_obj_t * par, lv_obj_t * copy)
     ext->cur_value = 0;
     ext->style_inicator = &lv_style_pretty_color;
 
-    /* Save the ancient design function.
-     * It will be used in the bar design function*/
-    if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_bar);
-
     lv_obj_set_signal_func(new_bar, lv_bar_signal);
     lv_obj_set_design_func(new_bar, lv_bar_design);
 
@@ -93,32 +94,6 @@ lv_obj_t * lv_bar_create(lv_obj_t * par, lv_obj_t * copy)
     return new_bar;
 }
 
-/**
- * Signal function of the bar
- * @param bar pointer to a bar object
- * @param sign a signal type from lv_signal_t enum
- * @param param pointer to a signal specific variable
- */
-bool lv_bar_signal(lv_obj_t * bar, lv_signal_t sign, void * param)
-{
-    bool valid;
-
-    /* Include the ancient signal function */
-    valid = lv_obj_signal(bar, sign, param);
-
-    /* The object can be deleted so check its validity and then
-     * make the object specific signal handling */
-    if(valid != false) {
-        if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
-            lv_style_t * style_indic = lv_bar_get_style_indicator(bar);
-            if(style_indic->body.shadow.width > bar->ext_size) bar->ext_size = style_indic->body.shadow.width;
-        }
-
-    }
-
-    return valid;
-}
-
 /*=====================
  * Setter functions
  *====================*/
@@ -311,4 +286,28 @@ static bool lv_bar_design(lv_obj_t * bar, const area_t * mask, lv_design_mode_t
     return true;
 }
 
+/**
+ * Signal function of the bar
+ * @param bar pointer to a bar object
+ * @param sign a signal type from lv_signal_t enum
+ * @param param pointer to a signal specific variable
+ * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
+ */
+static lv_res_t lv_bar_signal(lv_obj_t * bar, lv_signal_t sign, void * param)
+{
+    lv_res_t res;
+
+    /* Include the ancient signal function */
+    res = ancestor_signal(bar, sign, param);
+    if(res != LV_RES_OK) return res;
+
+    if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
+        lv_style_t * style_indic = lv_bar_get_style_indicator(bar);
+        if(style_indic->body.shadow.width > bar->ext_size) bar->ext_size = style_indic->body.shadow.width;
+    }
+
+    return LV_RES_OK;
+}
+
+
 #endif
diff --git a/lv_objx/lv_bar.h b/lv_objx/lv_bar.h
index a7fc1ebca9..c5fc7c06e6 100644
--- a/lv_objx/lv_bar.h
+++ b/lv_objx/lv_bar.h
@@ -52,14 +52,6 @@ typedef struct
  */
 lv_obj_t * lv_bar_create(lv_obj_t * par, lv_obj_t * copy);
 
-/**
- * Signal function of the bar
- * @param bar pointer to a bar object
- * @param sign a signal type from lv_signal_t enum
- * @param param pointer to a signal specific variable
- */
-bool lv_bar_signal(lv_obj_t * bar, lv_signal_t sign, void * param);
-
 /**
  * Set a new value on the bar
  * @param bar pointer to a bar object
diff --git a/lv_objx/lv_mbox.c b/lv_objx/lv_mbox.c
index 03e0e9cdff..fbaad55292 100644
--- a/lv_objx/lv_mbox.c
+++ b/lv_objx/lv_mbox.c
@@ -68,6 +68,7 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, lv_obj_t * copy)
     ext->style_btn_rel = &lv_style_btn_off_released;
     ext->style_btn_pr = &lv_style_btn_off_pressed;
     ext->anim_time = LV_MBOX_CLOSE_ANIM_TIME;
+    ext->btn_width = 0;
 
     /*The signal and design functions are not copied so set them here*/
     lv_obj_set_signal_func(new_mbox, lv_mbox_signal);
@@ -78,6 +79,7 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, lv_obj_t * copy)
     	lv_cont_set_fit(new_mbox, true, true);
 
     	ext->txt = lv_label_create(new_mbox, NULL);
+    	lv_label_set_align(ext->txt, LV_LABEL_ALIGN_CENTER);
     	lv_label_set_text(ext->txt, "Message");
 
     	lv_obj_set_style(new_mbox, &lv_style_pretty);
@@ -87,6 +89,7 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, lv_obj_t * copy)
         lv_mbox_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
 
         ext->txt = lv_label_create(new_mbox, copy_ext->txt);
+        ext->btn_width = copy_ext->btn_width;
 
         /*Copy the buttons and the label on them*/
         if(copy_ext->btnh != NULL) {
@@ -97,6 +100,10 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, lv_obj_t * copy)
                 lv_mbox_add_btn(new_mbox, btn_txt_copy, lv_btn_get_action(btn_copy, LV_BTN_ACTION_RELEASE));
             }
         }
+
+        lv_mbox_set_style(new_mbox, lv_mbox_get_style_bg(copy), lv_mbox_get_style_btnh(copy));
+        lv_mbox_set_style_btn(new_mbox, copy_ext->style_btn_rel, copy_ext->style_btn_pr);
+
         /*Refresh the style with new signal function*/
         lv_obj_refresh_style(new_mbox);
     }
@@ -133,7 +140,7 @@ lv_obj_t * lv_mbox_add_btn(lv_obj_t * mbox, const char * btn_txt, lv_action_t re
     /*Create a button holder if it is not existed yet*/
     if(ext->btnh == NULL) {
         ext->btnh = lv_cont_create(mbox, NULL);
-        lv_obj_set_style(ext->btnh, &lv_style_plain_color);
+        lv_obj_set_style(ext->btnh, &lv_style_transp_fit);
         lv_obj_set_click(ext->btnh, false);
         lv_cont_set_fit(ext->btnh, false, true);
         lv_cont_set_layout(ext->btnh, LV_CONT_LAYOUT_PRETTY);
@@ -142,7 +149,13 @@ lv_obj_t * lv_mbox_add_btn(lv_obj_t * mbox, const char * btn_txt, lv_action_t re
     lv_obj_t *btn = lv_btn_create(ext->btnh, NULL);
     lv_btn_set_action(btn, LV_BTN_ACTION_RELEASE, rel_action);
     lv_btn_set_style(btn, ext->style_btn_rel, ext->style_btn_pr, NULL, NULL, NULL);
-    lv_cont_set_fit(btn, true, true);
+
+    if(ext->btn_width) {
+        lv_btn_set_fit(btn, false, true);
+        lv_obj_set_width(btn, ext->btn_width);
+    } else {
+        lv_btn_set_fit(btn, true, true);
+    }
 
     lv_obj_t *label = lv_label_create(btn, NULL);
     lv_label_set_text(label, btn_txt);
@@ -169,6 +182,44 @@ void lv_mbox_set_text(lv_obj_t * mbox, const char * txt)
     btnh_resize(mbox);
 }
 
+/**
+ * Set the width of the buttons
+ * @param mbox pointer to message box object
+ * @param w width of the buttons or 0 to use auto fit
+ */
+void lv_mbox_set_btn_width(lv_obj_t *mbox, cord_t w)
+{
+    lv_mbox_ext_t * ext = lv_obj_get_ext_attr(mbox);
+    ext->btn_width = w;
+    if(ext->btnh == NULL) return;
+
+    lv_obj_t *btn = lv_obj_get_child(ext->btnh, NULL);
+    while(btn != NULL) {
+        if(w) {
+            lv_btn_set_fit(btn, false, true);
+            lv_obj_set_width(btn, w);
+        } else {
+            lv_btn_set_fit(btn, true, true);
+        }
+        btn = lv_obj_get_child(ext->btnh, btn);
+    }
+
+    btnh_resize(mbox);
+}
+
+/**
+ * Set the styles of a message box
+ * @param mbox pointer to a message box object
+ * @param bg pointer to the new background style
+ * @param btnh pointer to the new button holder style
+ */
+void lv_mbox_set_style(lv_obj_t *mbox, lv_style_t *bg, lv_style_t *btnh)
+{
+    lv_mbox_ext_t * ext = lv_obj_get_ext_attr(mbox);
+    lv_obj_set_style(ext->btnh, btnh);
+    lv_obj_set_style(mbox, bg);
+}
+
 /**
  * Set styles of the buttons of a message box in each state
  * @param mbox pointer to a message box object
@@ -251,6 +302,17 @@ const char * lv_mbox_get_text(lv_obj_t * mbox)
 	return lv_label_get_text(ext->txt);
 }
 
+/**
+ * Get width of the buttons
+ * @param mbox pointer to a message box object
+ * @return width of the buttons (0: auto fit enabled)
+ */
+cord_t lv_mbox_get_text(lv_obj_t * mbox)
+{
+    lv_mbox_ext_t * ext = lv_obj_get_ext_attr(mbox);
+    return ext->btn_width;
+}
+
 /**
  * Get the message box object from one of its button.
  * It is useful in the button release actions where only the button is known
@@ -276,6 +338,18 @@ uint16_t lv_mbox_get_anim_time(lv_obj_t * mbox )
     return ext->anim_time;
 }
 
+/**
+ * Get the style of a message box's button holder
+ * @param mbox pointer to a message box object
+ * @return pointer to the message box's background style
+ */
+lv_style_t * lv_mbox_get_style_btnh(lv_obj_t *mbox)
+{
+    lv_mbox_ext_t * ext = lv_obj_get_ext_attr(mbox);
+    return lv_obj_get_style(ext->btnh);
+}
+
+
 /**
  * Get the style of the buttons on a message box
  * @param mbox pointer to a message box object
@@ -435,8 +509,7 @@ static void btnh_resize(lv_obj_t *mbox)
     lv_mbox_ext_t * ext = lv_obj_get_ext_attr(mbox);
     if(ext->btnh == NULL) return;
 
-    lv_style_t *bg_style = lv_mbox_get_style(mbox);
-    lv_style_t *btnh_style = lv_mbox_get_style(ext->btnh);
+    lv_style_t *btnh_style = lv_mbox_get_style_bg(ext->btnh);
     cord_t btnh_req_w = 2 * btnh_style->body.padding.hor;
 
     lv_obj_t *btn = lv_obj_get_child(ext->btnh, NULL);
diff --git a/lv_objx/lv_mbox.h b/lv_objx/lv_mbox.h
index 0b2689a58c..bbe1a56a94 100644
--- a/lv_objx/lv_mbox.h
+++ b/lv_objx/lv_mbox.h
@@ -52,7 +52,8 @@ typedef struct
     lv_obj_t * btnh;            /*Holder of the buttons*/
     lv_style_t * style_btn_rel; /*Style of the released buttons*/
     lv_style_t * style_btn_pr;  /*Style of the pressed buttons*/
-    uint16_t anim_time;   /*Duration of close animation [ms] (0: no animation)*/
+    uint16_t anim_time;         /*Duration of close animation [ms] (0: no animation)*/
+    cord_t btn_width;           /*Button width (0: to auto fit)*/
 }lv_mbox_ext_t;
 
 /**********************
@@ -90,6 +91,21 @@ lv_obj_t * lv_mbox_add_btn(lv_obj_t * mbox, const char * btn_txt, lv_action_t re
  */
 void lv_mbox_set_text(lv_obj_t * mbox, const char * txt);
 
+/**
+ * Set the width of the buttons
+ * @param mbox pointer to message box object
+ * @param w width of the buttons or 0 to use auto fit
+ */
+void lv_mbox_set_btn_width(lv_obj_t *mbox, cord_t w);
+
+/**
+ * Set the styles of a message box
+ * @param mbox pointer to a message box object
+ * @param bg pointer to the new background style
+ * @param btnh pointer to the new button holder style
+ */
+void lv_mbox_set_style(lv_obj_t *mbox, lv_style_t *bg, lv_style_t *btnh);
+
 /**
  * Set styles of the buttons of a message box in each state
  * @param mbox pointer to a message box object
@@ -125,6 +141,13 @@ void lv_mbox_stop_auto_close(lv_obj_t * mbox);
  */
 const char * lv_mbox_get_text(lv_obj_t * mbox);
 
+/**
+ * Get width of the buttons
+ * @param mbox pointer to a message box object
+ * @return width of the buttons (0: auto fit enabled)
+ */
+cord_t lv_mbox_get_text(lv_obj_t * mbox);
+
 /**
  * Get the message box object from one of its button.
  * It is useful in the button release actions where only the button is known
@@ -148,30 +171,28 @@ uint16_t lv_mbox_get_anim_time(lv_obj_t * mbox );
  */
 lv_style_t * lv_mbox_get_style_btn(lv_obj_t * mbox, lv_btn_state_t state);
 
-/****************************
- * TRANSPARENT API FUNCTIONS
- ***************************/
+/**
+ * Get the style of a message box's button holder
+ * @param mbox pointer to a message box object
+ * @return pointer to the message box's background style
+ */
+lv_style_t * lv_mbox_get_style_btnh(lv_obj_t *mbox);
+
+/******************************
+ *  TRANSPARENT API FUNCTIONS
+ ******************************/
 
 /**
- * Set the style of a message box
+ * Get the style of a message box's background
  * @param mbox pointer to a message box object
- * @param style pointer to the new style
+ * @return pointer to the message box's background style
  */
-static inline void lv_mbox_set_style(lv_obj_t *mbox, lv_style_t * style)
-{
-    lv_obj_set_style(mbox, style);
-}
-
-/**
- * Get the style of a message box
- * @param mbox pointer to a message box object
- * @return pointer to the message box's style
- */
-static inline lv_style_t * lv_mbox_get_style(lv_obj_t *mbox)
+static inline lv_style_t * lv_mbox_get_style_bg(lv_obj_t *mbox)
 {
     return lv_obj_get_style(mbox);
 }
 
+
 /**********************
  *      MACROS
  **********************/
diff --git a/lv_objx/lv_slider.c b/lv_objx/lv_slider.c
index 33b3a4f1d4..4ea6a09cf7 100644
--- a/lv_objx/lv_slider.c
+++ b/lv_objx/lv_slider.c
@@ -32,6 +32,7 @@ static bool lv_slider_design(lv_obj_t * slider, const area_t * mask, lv_design_m
  *  STATIC VARIABLES
  **********************/
 static lv_design_func_t ancestor_design_f;
+static lv_signal_func_t ancestor_signal;
 
 /**********************
  *      MACROS
@@ -57,6 +58,9 @@ lv_obj_t * lv_slider_create(lv_obj_t * par, lv_obj_t * copy)
     lv_obj_t * new_slider = lv_bar_create(par, copy);
     dm_assert(new_slider);
     
+    if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_slider);
+    if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_slider);
+
     /*Allocate the slider type specific extended data*/
     lv_slider_ext_t * ext = lv_obj_allocate_ext_attr(new_slider, sizeof(lv_slider_ext_t));
     dm_assert(ext);
@@ -67,10 +71,6 @@ lv_obj_t * lv_slider_create(lv_obj_t * par, lv_obj_t * copy)
     ext->style_knob = &lv_style_pretty;
     ext->knob_in = 0;
 
-    /* Save the bar design function.
-     * It will be used in the sllider design function*/
-    if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_slider);
-
     /*The signal and design functions are not copied so set them here*/
     lv_obj_set_signal_func(new_slider, lv_slider_signal);
     lv_obj_set_design_func(new_slider, lv_slider_design);
@@ -105,7 +105,7 @@ bool lv_slider_signal(lv_obj_t * slider, lv_signal_t sign, void * param)
     bool valid;
 
     /* Include the ancient signal function */
-    valid = lv_bar_signal(slider, sign, param);
+    valid = ancestor_signal(slider, sign, param);
 
     /* The object can be deleted so check its validity and then
      * make the object specific signal handling */
diff --git a/lv_objx/lv_slider.h b/lv_objx/lv_slider.h
index 3295c5a4f2..361b58f4f2 100644
--- a/lv_objx/lv_slider.h
+++ b/lv_objx/lv_slider.h
@@ -111,7 +111,6 @@ lv_style_t * lv_slider_get_style_knob(lv_obj_t * slider);
  */
 bool lv_slider_get_knob_in(lv_obj_t * slider);
 
-
 /******************************
  *  TRANSPARENT API FUNCTIONS
  ******************************/
diff --git a/lv_objx/lv_sw.c b/lv_objx/lv_sw.c
index c3c8b1323d..c5eaff9761 100644
--- a/lv_objx/lv_sw.c
+++ b/lv_objx/lv_sw.c
@@ -25,6 +25,7 @@
 #if 0 /*Slider design is used*/
 static bool lv_sw_design(lv_obj_t * sw, const area_t * mask, lv_design_mode_t mode);
 #endif
+static lv_signal_func_t ancestor_signal;
 /**********************
  *  STATIC VARIABLES
  **********************/
@@ -52,6 +53,8 @@ lv_obj_t * lv_sw_create(lv_obj_t * par, lv_obj_t * copy)
     /*Create the ancestor of switch*/
     lv_obj_t * new_sw = lv_slider_create(par, copy);
     dm_assert(new_sw);
+
+    if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_sw);
     
     /*Allocate the switch type specific extended data*/
     lv_sw_ext_t * ext = lv_obj_allocate_ext_attr(new_sw, sizeof(lv_sw_ext_t));
@@ -98,7 +101,7 @@ bool lv_sw_signal(lv_obj_t * sw, lv_signal_t sign, void * param)
     ext->slider.action = NULL;  /*Do not let the slider to call the callback. The Switch will do it*/
 
     /* Include the ancient signal function */
-    valid = lv_slider_signal(sw, sign, param);
+    valid = ancestor_signal(sw, sign, param);
 
     /* The object can be deleted so check its validity and then
      * make the object specific signal handling */