private void fpspread1PaintTabStripButton(object sender, FarPoint.Win.Spread.PaintTabStripTabEventArgs e)
{
if (e.TabIndex = 0) {
e.Cancel = true;
RectangleF r = e.TabPath.GetBounds();
e.Graphics.FillRectangle(Brushes.Crimson, new RectangleF(e.TabRectangle.X, e.TabRectangle.Y, e.TabRectangle.Width, e.TabRectangle.Height));
}
}