wxDC::GetHandle support for wxGTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72226 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dc.h

@@ -136,7 +136,8 @@ public:
     virtual void EndPage() { }
 
     virtual GdkWindow* GetGDKWindow() const { return NULL; }
-
+    virtual void* GetHandle() const { return GetGDKWindow(); }
+    
     // base class pure virtuals implemented here
     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
     virtual void DoGetSizeMM(int* width, int* height) const;