Matlab - contar los click que se hace a un boton

function click_veces_OpeningFcn(hObject, eventdata, handles, varargin)

global count

count = 0;

handles.output = hObject;

guidata(hObject, handles);

function varargout = click_veces_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)

global count

count = count + 1;

if count >3

    msgbox('3 CLICKS','MENSAJE','help')

    return

end