Global variables in MATLAB GUI?

 I'm working with MATLAB GUI.

When I'm trying to access the variable which was defined with the push button, it is not defined in the pop up menu. The variables; it should be set 'global', so it is defined in the whole program. And I can use it in any callback.

Do you guys have any idea of how to make the variables 'global'?  

NOTE:-

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Answers: 
Wherever a global variable is going to be accessed in your code (say, different script files, functions etc.), it should be declared as such: global globalVariable;. Eg.: 
 
function myGUI_OpeningFcn(hObject, eventdata, handles, varargin)
    global myGlobalVar;
    myGlobalVar = [...]
    [...]
end
  
SEE COMPLETE ANSWER CLICK THE LINK    
https://matlabhelpers.com/questions/global-variables-in-matlab-gui-.php

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