How do I code matlab to recheck while loops before continuing?

Im trying to build a code that switches between codes based on button inputs. I want to first assign the variable exe=1 and then run while loops as exe=1, exe=2, exe=3 ... until exe=0 which means all conditions are met and the loop closes. Currently I have the main code of:

       %%%%%Begining of Script %%%%%

global exe
exe=1;

while exe==1
    main_menu=uicontrol('Style','pushbutton','Position',[20 20 100 100],'String','Pong','Callback',@setexe2);
    return
end

while exe==2
    main_menu2=uicontrol('Style','pushbutton','Position',[20 20 100 100],'String','Pong','Callback',@setexe1);
    return
end

       %%%%%End of Script %%%%%

I also have two function.m files used as callbacks for the uicontrol as follows

setexe1.m

function setexe1 (src,event)
global exe
exe=1;
close
end

setexe2

function setexe2 (src,event)
global exe
exe=2;
close
end

When I run the code, it does create a figure with the first button, and when I press the button, it closes the window and sets exe=2. But once the figure disappears, the next figure does not appear. What should I add and what should I change in order to be able to do the following.

%while exe=1
%    create button1
%    if button1 is pressed
%        close window and set exe=2
%while exe=2
%    create button2
%    if button2 is pressed
%        close window and set exe=1
%if exe=1 or 2
%    return to top
%if exe=0
%    end script

MATLAB 2018a Student Edition

Answer 1

[James Tursa]

Maybe something like this logic is what you need, although you don't specify a way to get exe set to 0 so you would have to add some more logic for that.

exe = 1;
while( exe ) % while exe is nonzero
    if( exe==1 )
        %    create button1
        %    if button1 is pressed
        %        close window and set exe=2
    end
    if( exe==2 )
        %    create button2
        %    if button2 is pressed
        %        close window and set exe=1
    end
end