protected override GraphicsPath CreateBorderRectPath(RectangleF innerBorderRect)
{
SizeF headerLabelSize = _headerLabel.DesiredSize;
return(GraphicsPathHelper.CreateRoundedRectWithTitleRegionPath(innerBorderRect,
(float)CornerRadius, (float)CornerRadius, true, HEADER_INSET_LINE,
headerLabelSize.Width + HEADER_INSET_SPACE * 2));
}