fix client to screen (and vice versa) conversion

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37546 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -5432,6 +5432,16 @@ bool wxGenericListCtrl::DoPopupMenu( wxMenu *menu, int x, int y )
 #endif
 }
 
+void wxGenericListCtrl::DoClientToScreen( int *x, int *y ) const
+{
+    return m_mainWin->DoClientToScreen(x, y);
+}
+
+void wxGenericListCtrl::DoScreenToClient( int *x, int *y ) const
+{
+    return m_mainWin->DoScreenToClient(x, y);
+}
+
 void wxGenericListCtrl::SetFocus()
 {
     // The test in window.cpp fails as we are a composite