GUI stop button for ode45

I am making a GUI where I am solving a system of ODE's using ode45, and I whish to have a stop button in my GUI. I have tried the following, without success. The value of handles.Flag is changed when I push the button, but the outputfunction doesn't seem to notice. Any suggestions?

The function where I call ode45 is given under:

function Start_Callback(hObject, eventdata, handles)
% hObject    handle to Start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

handles.Flag = false;
....
opts=odeset; 
opts=odeset(opts,'RelTol',1e-6,'AbsTol',1e-9,'Stats','on','OutputFcn',...
    @odeOut);
ode45(@odefun4,tspan,T2,opts);

Where odeOut is:

handles = guidata(gcbo);
...
if handles.Flag
        status=true;
else
        status = false;
end
guidata(gcbo, handles);

And the stop button function is:

function Stop_Callback(hObject, eventdata, handles)
% hObject    handle to Stop (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles.Flag = true;
% save the changes to the structure
guidata(hObject,handles)

[EDITED, Jan Simon, code formatted]

Answer 1

[Jan]

You define "status" in the OutputFcn. But what happens with this value? Did you try to set a breakpoint in the "status=false" line to see what happens?

I do not find a description of the flag replied by the OutputFcn in the documentation. I do not expect, that it is sufficient for stopping the integration. But the Event function has a flag, which can be used for this reason.

[Per-Kristian]

Sorry, this should be on top of the odeOut:

function status = odeOut(t,y,flag,varargin,data).

It says in the odeset documentation that the integration will stop if status=1. If I display the value of status in odeOut it is false all the time. If I press the stop button handles.Flag=true, but this doesn't seem to affect the handles.Flag inside the OutputFcn.