Question: simple example for: combo-box with embedded components

I am creating an user interface with embedded components (Labels, Buttons, plotwindow ...).

All works well.

Now I need to include a combobox selection in that code. I can't get any further with that.

The specific question is what to type here (this is "edit selected code", in the combobox options)

use DocumentTools in 

end use; 

to get the choosen value as a variable in the rest of the code (startup code and other code in buttons with edit click code).

A simple example explaining that would be very helpfull:)

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