Code

private void fcx1_MouseDownEvent(object sender, AxFLOWCHARTLib._IFlowChartEvents_MouseDownEvent e)
    {
	switch (e.button)
	{
	  case FLOWCHARTLib.EMouseButton.mbLeft:

	    break;
	  case FLOWCHARTLib.EMouseButton.mbMiddle:

	    break;
	  case FLOWCHARTLib.EMouseButton.mbRight:

	    int TbarHeight = this.Height - this.ClientSize.Height;
	    menuFCX.Show(e.docX+this.Left, e.docY+this.Top+TbarHeight);

	    break;
	}
    }