internal static extern int GetThemePartSize( IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, IntPtr pClipRect, THEME_SIZE eSize, ref SIZE pSize);
internal static extern int GetThemePartSize( IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, IntPtr pClipRect, THEME_SIZE eSize, ref SIZE pSize);