Changed ComboDropDown button under GTK+ so that it

will create a transparent button. This works for
    the date control, but should be generalized somehow.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32462 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/renderer.cpp

@@ -396,19 +396,6 @@ void wxRendererGTK::DrawComboBoxDropButton(wxWindow *win,
     else
         state = GTK_STATE_NORMAL;
 
-    // erase background first
-    gtk_paint_box
-    (
-        button->style,
-        wdc.m_window,
-        state,
-        GTK_SHADOW_NONE,
-        NULL,
-        button,
-        "button",
-        rect.x, rect.y, rect.width, rect.height
-    );
-
     // draw arrow on button
     gtk_paint_arrow
     (