How do i use 3 checkboxes to plot graphs on same axes and be able to uncheck any particular box in guide

I am trying to use 3 checkboxes to create 3 plots on same axis.When checkbox1 is checked,only its plot is shown and when its unchecked there is no plot.Similarly when I check or uncheck the other checkboxes too,it should do the same.Also ,if i check checkbox 2 and 3,it should show both plots for it. I was able to check and uncheck checkboxes separately. But the problem occurs,when I have all three boxes checked(all 3 plots on the axes) and then try to uncheck them,they don't work like they should.I am not able to understand the problem.

Here is the relevant code:

*% --- Executes on button press in checkbox1.

function checkbox1_Callback(hObject, eventdata, handles)

% hObject handle to checkbox1

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data

axes(handles.axes1);

if get(hObject, 'Value')

    x=[22;33;44];
    y=[10,22,33];
  handles.plot = plot(x,y,'r');
  hold on

else

delete(handles.plot);

handles.plot = [];

end

guidata(hObject, handles);

and similar code for checkbox 2 and 3. Any help will be appreciated.

[faiza]

Still stuck with the problem.Math works please rescue me