protected virtual void ListViewDrawColumnHeaderBackground (ListView listView, ColumnHeader columnHeader, Graphics g, Rectangle area, Rectangle clippingArea)
{
ButtonState state;
if (listView.HeaderStyle == ColumnHeaderStyle.Clickable)
state = columnHeader.Pressed ? ButtonState.Pushed : ButtonState.Normal;
else
state = ButtonState.Flat;
CPDrawButton (g, area, state);
}