Writing callback functions for programmatical GUI with a handles argument

Callback function handles in GUIDE take on the form:

@(hObject,eventdata)mygui('some_Callback',hObject,eventdata,guidata(hObject))

I have written function handles of this form for my programmatically created GUI, but when running them, I get the following error:

??? Error using ==> report_manager
Too many input arguments.

Error in ==>
report_manager>makeCallback/@(hObject,eventdata)mygui('some_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

The make callback function it's referencing looks like:

function callback = makeCallback ( callback_name )
callback = {evalin('base',['@(hObject,eventdata)mygui','(''',callback_name,''',hObject,eventdata,guidata(hObject))'])};

I have no problem in creating callbacks when they take the simple form: callback = {@fnhandle_Callback}

The problem with this is that to get the handles array, I have to have a line of code in each callback handles=guidata(hObject). What do I need to change to include the 3rd argument in my callbacks?