Why vid.StopFcn in Image Acquisition Toolbox doesn't work in appdesigner but works just fine in Guide?

I've made an application using guide that acquires an images with the Image Acquisition Toolbox. In the Start callback function I initialize the property vid.StopFnc like that :

vid.StopFcn = {@StopRun, handles};

Then the function is :

function StopRun(vid,event, handles)

% Set Interface

handles.toggle_StartAcq.BackgroundColor = [0.3 0.75 0.93];

handles.toggle_StartAcq.Value = 0;

handles.push_FlushIm.Enable = 'on';

When I do the same with appdesigner I always get this error : Undefined function 'StopRun' for input arguments of type 'videoinput'.

I get this error with private or public function.

Anyone knows what happening?

Thanks

Denis