How to use variable of another function with a function? switch-case. Matlab Gui

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Ekin 2013-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/85514-how-to-use-variable-of-another-function-with-a-function-switch-case-matlab-gui

I want to call a variable in a popupmenu from a button. I mean, popup value will only show the current status and when I press the button it will operate according to the popup menu status. Here is my code, i get "Undefined function or variable 'popupmenu4value" error when i press the button.

 function pushbutton1_Callback(hObject, eventdata, handles)
 switch popupmenu4value
    case 'A'
%function of A
    case 'B'
%function of B
 function popupmenu4_Callback(hObject, eventdata, handles)
 contents = get(handles.popupmenu4,'String'); 
 popupmenu4value = contents{get(handles.popupmenu4,'Value')};

I found axesMenuToolbar in gui examples but it is written in older verison and i can't use it. what i want is exactly this "axesMenuToolbar" help gui. thanks in advance..