The edit uicontrol's callback function should get it's string and set something else in the popup.
More per comments
In this case you should use addlistener() to add a listener to the 'PostSet' 'string' event broadcasted by each edit box. The documentation for addlistener() is here:
The call would look something like this:
for ii = 1:numel(hEdit) %where hEdit is the vector of edit box handles
addlistener(hEdit(ii),'PostSet','string',@(src,evt)set(hPopUp,'value',1))
end
