void winCanvas_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
int x = e.X, y = this.BindingCanvas.Height - e.Y - 1;
GLControl control = GetControlAt(x, y, this);
this.currentControl = control;
if (control != null)
{
GLMouseEventArgs args = e.Translate();
control.InvokeEvent(EventType.MouseDown, args);
}
}
