/// <summary>
/// Returns the topmost control at the specified coordinate.
/// </summary>
/// <param name="cc">The control collection.</param>
/// <param name="p">The coordinate.</param>
/// <returns>
/// If there is a control at the position the topmost, otherwise null.
/// </returns>
protected static Control GetTopControlAt(ControlCollection cc, Point p)
{
for (int i = cc.Count - 1; i >= 0; i--)
{
Control c = cc.GetControlByZOrder(i);
if (c.HitTest(p))
{
return(GetTopControlAt(c.Controls, p) ?? c);
}
}
return(null);
}