Lotta stuff for drawing etc.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6436 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/dcscreen.cpp

@@ -38,6 +38,8 @@ wxScreenDC::wxScreenDC()
     m_cmap = gdk_colormap_get_system();
     m_window = GDK_ROOT_PARENT();
 
+    m_isScreenDC = TRUE;
+
     SetUpDC();
 
     gdk_gc_set_subwindow( m_penGC, GDK_INCLUDE_INFERIORS );