I have a a simpe graph, say sine wave. Using uicontrol i added a check box on the above-mentioned sinwave figure. Now on check box click/unclick a vertical line appears/disppears on figure. I wanwant to have handle of this line to slide it on the si

uicontrol('type','checkbox','string','plz tick','callback','{@dt,xm}');
Function H = dt(hObject,xm)
H=line([xm xm] [-1 1]);
end