// Tab Context Menu
private void TabContMenu_Opening(object sender, CancelEventArgs e)
{
Point p = Control.MousePosition;
Rectangle rTab;
for (int i = 0; i <= TabControl1.TabCount - 1; i++)
{
rTab = TabControl1.RectangleToScreen(TabControl1.GetTabRect(i));
if (rTab.Contains(p))
{
TabControl1.SelectedIndex = i;
break;
}
}
}