Fixed wxComboCtrl::SetButtonPosition() on Vista/Win7 by marking the drop-down button as 'non-standard' when its size or position is changed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64410 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/combocmn.cpp

@@ -2335,6 +2335,9 @@ void wxComboCtrlBase::SetButtonPosition( int width, int height,
     m_btnSide = side;
     m_btnSpacingX = spacingX;
 
+    if ( width > 0 || height > 0 || spacingX )
+        m_iFlags |= wxCC_IFLAG_HAS_NONSTANDARD_BUTTON;
+
     RecalcAndRefresh();
 }