mec123 - suppose that you have two checkboxes, checkbox1 and checkbox2, with the latter being enabled only if checkbox1 is checked. To disable the second one, in the OpeningFcn of your GUI you would do
function myGui_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
set(handles.checkbox2,'Enable','off');
Then in the callback for your first checkbox, you would do
function checkbox1_Callback(hObject, eventdata, handles)
if get(hObject,'Value') == 1
set(handles.checkbox2,'Enable','on');
else
set(handles.checkbox2,'Value',0,'Enable','off');
end
If checkbox1 is checked (and so its Value property is set to one) then we enable the other checkbox. Else if checkbox1 is unchecked (and so its Value property is set to zero) then we clear the checked state of checkbox2 and disable it.
