diff --git a/include/Mw/Core.h b/include/Mw/Core.h
index bd4a7ee..9768951 100644
--- a/include/Mw/Core.h
+++ b/include/Mw/Core.h
@@ -28,6 +28,16 @@
 #define MwDispatch2(x, y) \
 	((x->widget_class != NULL && x->widget_class->y != NULL) ? x->widget_class->y(x) : 0)
 
+/*!
+ * %warning Used internally
+ * %brief Dispatches the handler of widget class
+ * %param x Widget
+ * %param y Handler name
+ * %param name Property name
+ */
+#define MwDispatch3(x, y, name) \
+	((x->widget_class != NULL && x->widget_class->y != NULL) ? x->widget_class->y(x, name) : 0)
+
 #define MwWaitMS 5
 
 #ifdef __cplusplus
diff --git a/include/Mw/TypeDefs.h b/include/Mw/TypeDefs.h
index 32b9b2e..b6b83cc 100644
--- a/include/Mw/TypeDefs.h
+++ b/include/Mw/TypeDefs.h
@@ -25,7 +25,7 @@ typedef void* MwWidget;
 #endif
 typedef void (*MwHandler)(MwWidget handle);
 typedef int (*MwHandler2)(MwWidget handle);
-typedef int (*MwHandler3)(MwWidget handle, const char* key);
+typedef void (*MwHandler3)(MwWidget handle, const char* key);
 typedef void (*MwUserHandler)(MwWidget handle, void* user_data, void* call_data);
 typedef void (*MwErrorHandler)(int code, const char* message, void* user_data);
 
@@ -79,6 +79,7 @@ struct _MwWidget {
 	MwPoint mouse_point;
 	int	close;
 	jmp_buf before_step;
+	int	prop_event;
 
 	void* internal;
 
diff --git a/src/core.c b/src/core.c
index f39458b..b79a8fe 100644
--- a/src/core.c
+++ b/src/core.c
@@ -83,6 +83,7 @@ MwWidget MwCreateWidget(MwClass widget_class, const char* name, MwWidget parent,
 	h->pressed	 = 0;
 	h->close	 = 0;
 	h->destroy_queue = NULL;
+	h->prop_event	 = 1;
 
 	h->lowlevel->user	     = h;
 	h->lowlevel->handler->draw   = lldrawhandler;
@@ -171,7 +172,11 @@ void MwStep(MwWidget handle) {
 	int i, j;
 	if(setjmp(handle->before_step)) return;
 	for(i = 0; i < arrlen(handle->children); i++) MwStep(handle->children[i]);
+
+	handle->prop_event = 0;
 	MwLLNextEvent(handle->lowlevel);
+	handle->prop_event = 1;
+
 	for(i = 0; i < arrlen(handle->destroy_queue); i++) {
 		MwWidget w = handle->destroy_queue[i];
 
@@ -222,6 +227,7 @@ void MwSetInteger(MwWidget handle, const char* key, int n) {
 	} else {
 		shput(handle->integer, key, n);
 	}
+	if(handle->prop_event) MwDispatch3(handle, prop_change, key);
 }
 
 void MwSetText(MwWidget handle, const char* key, const char* value) {
@@ -235,6 +241,10 @@ void MwSetText(MwWidget handle, const char* key, const char* value) {
 
 		shput(handle->text, key, v);
 	}
+	if(handle->prop_event) MwDispatch3(handle, prop_change, key);
+	if(strcmp(key, MwNbackground) == 0 || strcmp(key, MwNforeground) == 0) {
+		MwForceRender(handle);
+	}
 }
 
 void MwSetVoid(MwWidget handle, const char* key, void* value) {
@@ -243,6 +253,7 @@ void MwSetVoid(MwWidget handle, const char* key, void* value) {
 	} else {
 		shput(handle->data, key, value);
 	}
+	if(handle->prop_event) MwDispatch3(handle, prop_change, key);
 }
 
 int MwGetInteger(MwWidget handle, const char* key) {
diff --git a/src/widget/button.c b/src/widget/button.c
index 9f4f2dd..4b0d5bd 100644
--- a/src/widget/button.c
+++ b/src/widget/button.c
@@ -61,13 +61,17 @@ static void click(MwWidget handle) {
 	MwDispatchUserHandler(handle, MwNactivateHandler, NULL);
 }
 
+static void prop_change(MwWidget handle, const char* key) {
+	if(strcmp(key, MwNtext) == 0 || strcmp(key, MwNpixmap) == 0) MwForceRender(handle);
+}
+
 MwClassRec MwButtonClassRec = {
     create,	   /* create */
     NULL,	   /* destroy */
     draw,	   /* draw */
     click,	   /* click */
     NULL,	   /* parent_resize */
-    NULL,	   /* prop_change */
+    prop_change,   /* prop_change */
     NULL,	   /* mouse_move */
     MwForceRender, /* mouse_up */
     MwForceRender  /* mouse_down */
diff --git a/src/widget/checkbox.c b/src/widget/checkbox.c
index 095f56d..570f691 100644
--- a/src/widget/checkbox.c
+++ b/src/widget/checkbox.c
@@ -33,13 +33,17 @@ static void click(MwWidget handle) {
 	MwDispatchUserHandler(handle, MwNchangedHandler, NULL);
 }
 
+static void prop_change(MwWidget handle, const char* key) {
+	if(strcmp(key, MwNchecked) == 0) MwForceRender(handle);
+}
+
 MwClassRec MwCheckBoxClassRec = {
     create,	   /* create */
     NULL,	   /* destroy */
     draw,	   /* draw */
     click,	   /* click */
     NULL,	   /* parent_resize */
-    NULL,	   /* prop_change */
+    prop_change,   /* prop_change */
     NULL,	   /* mouse_move */
     MwForceRender, /* mouse_up */
     MwForceRender  /* mouse_down */
diff --git a/src/widget/image.c b/src/widget/image.c
index 733b77d..23a942c 100644
--- a/src/widget/image.c
+++ b/src/widget/image.c
@@ -20,15 +20,19 @@ static void draw(MwWidget handle) {
 	}
 }
 
+static void prop_change(MwWidget handle, const char* key) {
+	if(strcmp(key, MwNpixmap) == 0) MwForceRender(handle);
+}
+
 MwClassRec MwImageClassRec = {
-    create, /* create */
-    NULL,   /* destroy */
-    draw,   /* draw */
-    NULL,   /* click */
-    NULL,   /* parent_resize */
-    NULL,   /* prop_change */
-    NULL,   /* mouse_move */
-    NULL,   /* mouse_up */
-    NULL    /* mouse_down */
+    create,	 /* create */
+    NULL,	 /* destroy */
+    draw,	 /* draw */
+    NULL,	 /* click */
+    NULL,	 /* parent_resize */
+    prop_change, /* prop_change */
+    NULL,	 /* mouse_move */
+    NULL,	 /* mouse_up */
+    NULL	 /* mouse_down */
 };
 MwClass MwImageClass = &MwImageClassRec;
diff --git a/src/widget/label.c b/src/widget/label.c
index 3c2bb69..40db38d 100644
--- a/src/widget/label.c
+++ b/src/widget/label.c
@@ -40,15 +40,19 @@ static void draw(MwWidget handle) {
 	MwLLFreeColor(base);
 }
 
+static void prop_change(MwWidget handle, const char* key) {
+	if(strcmp(key, MwNtext) == 0 || strcmp(key, MwNalignment) == 0) MwForceRender(handle);
+}
+
 MwClassRec MwLabelClassRec = {
-    create, /* create */
-    NULL,   /* destroy */
-    draw,   /* draw */
-    NULL,   /* click */
-    NULL,   /* parent_resize */
-    NULL,   /* prop_change */
-    NULL,   /* mouse_move */
-    NULL,   /* mouse_up */
-    NULL    /* mouse_down */
+    create,	 /* create */
+    NULL,	 /* destroy */
+    draw,	 /* draw */
+    NULL,	 /* click */
+    NULL,	 /* parent_resize */
+    prop_change, /* prop_change */
+    NULL,	 /* mouse_move */
+    NULL,	 /* mouse_up */
+    NULL	 /* mouse_down */
 };
 MwClass MwLabelClass = &MwLabelClassRec;
diff --git a/src/widget/scrollbar.c b/src/widget/scrollbar.c
index 4f0daee..f12ced0 100644
--- a/src/widget/scrollbar.c
+++ b/src/widget/scrollbar.c
@@ -181,13 +181,17 @@ static void mouse_down(MwWidget handle) {
 	MwForceRender(handle);
 }
 
+static void prop_change(MwWidget handle, const char* key) {
+	if(strcmp(key, MwNminValue) == 0 || strcmp(key, MwNvalue) == 0 || strcmp(key, MwNmaxValue) == 0 || strcmp(key, MwNareaShown) == 0) MwForceRender(handle);
+}
+
 MwClassRec MwScrollBarClassRec = {
     create,	   /* create */
     destroy,	   /* destroy */
     draw,	   /* draw */
     NULL,	   /* click */
     NULL,	   /* parent_resize */
-    NULL,	   /* prop_change */
+    prop_change,   /* prop_change */
     mouse_move,	   /* mouse_move */
     MwForceRender, /* mouse_up */
     mouse_down	   /* mouse_down */