MATLAB: A supper simple GUI with only one push button doesn’t work weirdly

matlab gui

I created a very simple GUI on MATLAB version R2015a. That program just only contains a push button like below figure:
When the button is hit, the callback "disp('Hello World')" will be executed. But when I run the GUI, nothing happens. Could some one help me? Below is the callback:
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%surf(membrane(1))
disp('Hello World')
%guidata(hObject, handles);

Best Answer

Set a breakpoint on the disp line to see if it gets there.
Are you sure you looked in the command window?
Instead of disp(), try this:
uiwait(helpdlg('Hello Chuong!'));
to put it in a popup message box instead of the command window.
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