if(!bEnabled) { return; }
    public void mouseDown(MouseEvent e)    {        if (e.getSource() instanceof LineCanvas)        {            if (e.getSource().equals(this.cnvSelection))            {                toggleDropDown();            }            else            {                this.iCurrentWidth = ((LineCanvas) e.getSource()).getLineWidth();                this.cnvSelection.setLineWidth(iCurrentWidth);                this.cnvSelection.redraw();                fireEvent();                this.cmpDropDown.getShell().dispose();            }        }    }