How to use a Radio Button Group

I have been trying to program a radio button group to display a set of gui components when one radio button is selected and a different set whne another radio buttonis selected. This GUI is a pop up window from another GUI. When the radio button is clicked the error attempt to reference field of non-structure array pops up. Heres my code

 Build the Hfig that pops up when the product expectations tab is called
function h = ProductE(hObject, eventdata, h)
h.ProdE_fig = figure('Position', [95 459 300 250], 'MenuBar', 'None');

% Builds a Radio Button Set for the Panel h.buttonGroup = uibuttongroup('parent', h.ProdE_fig, 'Title',... 'Products Returned', 'Position', [0.55 0.352 0.4 0.35],... 'selectionchangefcn', @For_Inv_SelectionChangeFc);

h.ProdE_Radio1 = uicontrol('parent', h.buttonGroup, 'Style', 'radiobutton',... 'String', 'Forward', 'Units', 'normalized',... 'Value', 1, 'Position', [0.1 0.6 0.7 0.2], 'Tag', 'Forward');

h.ProdE_Radio2 = uicontrol('parent', h.buttonGroup, 'Style', 'radiobutton', ... 'String', 'Inverse', 'Units', 'normalized',... 'Position', [0.1 0.2 0.7 0.2], 'Tag', 'Inverse'); % h.buttonGroup('SelectionChangeFcn', {@For_Inv_SelectionChangeFcn}); %set(h.ProdE_Radio1, 'callback', {@For_Inv_SelectionChangeFcn}); set(h.ProdE_Radio2, 'callback', {@For_Inv_SelectionChangeFcn}); % guidata(hObject, h); end % function h = For_Inv_SelectionChangeFcn(hObect, eventdata, h) %Builds thhe Edit and Static Text Fields that coorespound with When Forward %is selected switch get(eventdata.NewValue, 'Tag') case 'Forward' bug 12 h.Forward_Edit1= uicontrol('parent', h.ProdE_fig, 'Style', 'edit', ... 'String', 'Enter a Number', [100 475 75 40]); h.Forward_Edit2= uicontrol('parent', h.ProdE_fig, 'Style', 'edit', ... 'String', 'Enter a Number', [50 160 75 40]); h.Forward_Edit3= uicontrol('parent', h.ProdE_fig, 'Style', 'edit', ... 'String', 'Enter a Number', [50 100 75 40]); % Build Static Text Boxes h.Forward_Static1 = uicontrol('parent', h.ProdE_fig, 'Style', 'text', ... 'String', '# Fractures', 'Position', [10 220 50 40]); h.Forward_Static2 = uicontrol('parent', h.ProdE_fig, 'Style', 'text', ... 'String', 'Fracture Spacing', 'Position', [10 160 50 40]); h.Forward_Static3 = uicontrol('parent', h.ProdE_fig, 'Style', 'text', ... 'String', 'Injection Rate', 'Position', [10 100 50 40]); case 'Inverse' bug 22

      %%%TODO: MAKE A CALL BACK FOR THE RADIO BUTTON IT NEED TO have one
end
end

Does anyone have any ideas. Thanks a lot.