ROIPOLY Issue with GUI help??

Hi everyone,

Thanks to Geoff hayes help, I now have this code under my pushbutton4 function in a GUI:

% --- Executes on button press in pushbutton4.      Choose Crop area
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
filename = uigetfile('*.*');
myimage = imread(filename);
[BW, xi, yi] = roipoly(myimage);

handles.xMin = min(xi);
handles.xMax = max(xi);
handles.yMin = min(yi);
handles.yMax = max(yi);
guidata(hObject, handles);

However, when I click this button, the ROIPOLY function starts but the picture opens in the GUI, actually behind al the pushbutton animations! How do I get the ROIPOLY editing figure to open as a separate figure? When I use ROIPOLY in a normal script it works fine opening in its own window allowing you to zoom in and out as desired. How do I do this in a GUI?

Many thanks,

Ellis