[Gtk-sharp-list] Problem of menu highlighting on Vista

[libin]

I am using the following code snippet to change the back ground color of the
menu item when cursor is placed on them 
 
Gdk.Color col = new Gdk.Color();
Gdk.Color.Parse("red", ref col);
imageMenuItem.ModifyBg(StateType.Prelight, col);
 
In XP the menu item is highlighted with blue color and text is appearing
fine. But In vista the menu item is highlighted with white color and the
text is not visible.
 
Can any one please tell me why is this not working in vista?
 
Many thanks- Libin

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