>Hello Mike and thank you for your quick reply! Unfortunatly, it can't be the answer as I do refresh twice (once in my code and once in the inherited code in the navrefresh of the buttonset).
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>Thank you again!

Sorry that was not the answer. Given that you only made minor changes, I would be tempted to go back to backup copies of the form and the buttonset and then reconvert the textbox to a combo box.