Fill add-in userform and execute macro

Hi all,

probably a very easy one: I've got an userform in an add-in. I'd like to fill in some variables (textboxes, checkboxes etc) and then simulate the pressing of a commandbutton on that addin-userform from another workbook.

I thought it'd be easy like:

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But it doesnt seem to work. Anyone got a clue on this? I could write another code within the addin which would take all the variables from the other workbook and pass them along to the userform but I'd like to do it directly.

Thanks