protected virtual void DrawRibbonTabHighlightRight(Rectangle rect,
Color c4, Color c5,
MementoRibbonTabHighlight cache)
{
RectangleF hF = new RectangleF(rect.Right - 6, rect.Top - 2, 6, rect.Height - 4);
RectangleF vF = new RectangleF(rect.Left, rect.Top - 2, rect.Width - 1, rect.Height - 4);
cache.topBorderBrush = new LinearGradientBrush(hF, Color.FromArgb(48, c5), Color.FromArgb(64, c5), 180f);
cache.borderVertBrush = new LinearGradientBrush(vF, c5, c4, 180f);
cache.outsideVertBrush = new LinearGradientBrush(vF, Color.FromArgb(48, c5), c5, 180f);
}