/// <summary>
/// Get the control at specified position.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="control"></param>
/// <returns></returns>
private GLControl GetControlAt(int x, int y, GLControl control)
{
GLControl result = null;
if (control.ContainsPoint(x, y))
{
if (control.AcceptPicking)
{
result = control;
}
foreach (var item in control.Children)
{
GLControl child = GetControlAt(x, y, item);
if (child != null)
{
result = child;
break;
}
}
}
return(result);
}