Added wxComboPopup::DestroyPopup(), which responsibility is to call Destroy() for the popup control and also delete the combo popup object itself. The default implementation should be able to handle common cases.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67365 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/combo.h

@@ -36,6 +36,14 @@ public:
     */
     virtual bool Create(wxWindow* parent) = 0;
 
+    /**
+        You only need to implement this member function if you create
+        your popup class in non-standard way. The default implementation can
+        handle both multiple-inherited popup control (as seen in wxComboCtrl
+        samples) and one allocated separately in heap.
+    */
+    virtual void DestroyPopup();
+
     /**
         Utility function that hides the popup.
     */