_widgetToDestroy should be private, enlarged documentation

src/dlangui/core/events.d

@@ -1649,9 +1649,14 @@ class RunnableEvent : CustomEvent {
     }
 }
 
-/// queue destroy event
+/**
+Queue destroy event.
+
+This event allows delayed widget destruction and is used internally by 
+$(LINK2 $(DDOX_ROOT_DIR)dlangui/platforms/common/platform/Window.queueWidgetDestroy.html, Window.queueWidgetDestroy()).
+*/
 class QueueDestroyEvent : RunnableEvent {
-    Widget _widgetToDestroy;
+    private Widget _widgetToDestroy;
     this (Widget widgetToDestroy)
     {
         _widgetToDestroy = widgetToDestroy;

src/dlangui/platforms/common/platform.d

@@ -519,7 +519,18 @@ class Window : CustomEventTarget {
         destroy(_timerQueue);
         _eventList = null;
     }
-    /// queue destroy widget
+    
+    /**
+    Allows queue destroy of widget.
+    
+    Sometimes when you have very complicated UI with dynamic create/destroy lists of widgets calling simple destroy() 
+    on widget makes segmentation fault.
+    
+    Usually because you destroy widget that on some stage call another that tries to destroy widget that calls it.
+    When the control flow returns widget not exist and you have seg. fault.
+    
+    This function use internally $(LINK2 $(DDOX_ROOT_DIR)dlangui/core/events/QueueDestroyEvent.html, QueueDestroyEvent).
+    */
     void queueWidgetDestroy(Widget widgetToDestroy)
     {
         QueueDestroyEvent ev = new QueueDestroyEvent(widgetToDestroy);