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From: pedro moreno on 27 Jul 2010 02:30
Yes, thanks Walter, the solution is:

GUI_1:

function pushbutton_Callback(hObject, eventdata, handles)
gui2; %it returns GUI_2
waitfor(gui2);
load('acept_cancel.mat');
if b_Acept
set(handles.pushbutton2,'BackgroundColor',[0 1 0]); %green colour
%else, it keeps the default grey colour
end

GUI_2:

function pushbutton1_Callback(hObject, eventdata, handles)
%Button ACEPT
b_Acept= true;
save('acept_cancel.mat',b_Acept);
close;

function pushbutton2_Callback(hObject, eventdata, handles)
%Button CANCEL
b_Acept= false;
save('acept_cancel.mat',b_Acept);
close;

It works, but a tiny cons is... it looks like the GUI_2 shakes a little at the begining...
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