How do I use the close request function for a figure to update a list box in a GUIDE GUI?

I'm trying to update a list box I have of all the current figure plot that have been opened by the GUI with the close request function but can't seem to get the appropriate data to be passed through. here is my close request function

function my_closereq(src,evnt)
% User-defined close request function 
% to display a question dialog box 
   WPW_handles = guihandles(WPW_GUI);
   handles = guidata(WPW_handles.WPW);
   figlist = get(handles.figList,'string');
   bool1 = logical(strcmpi(figlist,get(gcf,'name')));
   selection = questdlg('Close This Figure?',...
      'Close Request Function',...
      'Yes','No','Yes'); 
   switch selection, 
      case 'Yes',
          numPlots = handles.numPlots;
         if numPlots >0
            %numPlots = guidata(handles.numPlots);
            figname = handles.figName;
            figlist = get(handles.figList,'string');
            bool1 = logical(strcmpi(figlist,figname));
            figlist(bool1) = [];
            %num = length(figlist);
            delete(gcf)
            numPlots = numPlots -1;
            if numPlots <= 0
                figlist = cellstr('');
                set(handles.figList,'string',figlist,'Value',1);
            else
                set(handles.figList,'string',figlist,'Value',numPlots);
            end
            handles.numPlots = numPlots;
        elseif handles.numPlots <0
            handles.numPlots = 0;
            delete(gcf)
        end
        guidata(WPW_handles,handles);

        case 'No'
        return 
     end
I've ran it with debug and all the variables are wrong any help would be awesome