How do I display initial value of popup menu at GUI launch?

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I am able to call up whatever value is shown after an initial selection, but the default value is still not getting used at launch. I have boiled this down to a much simpler GUI that basically displays whatever selection you have. What I would like to be able to do is have this display 'A' when the program launches, then A, B, C or D once they are selected from the popup menu.
See attached help.m file.
What am I piece of this puzzle am I missing?
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