Thank you for the idea with repeat. However, I am not sure if this will have negative implications for my app, if this is set to "run" all the time when the UI is open. I will need to test it. Probably, hacking the source will be a better solution.

In reply to Re^2: Tk programmatically monitor change in Listbox by IB2017
in thread Tk (Tcl::Tk) programmatically monitor change in Listbox by IB2017

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