How to make ComboBox open up, not down?
  • Try to put it on the very edge of the form. - alexstas7
  • On which edge is it at my bottom and I need to set the opening up when you click on DropDownItem? - Demon

2 answers 2

You need to edit the template of the combo and change the parameters of the drop-down element (Popup) so that it appears from above, not from below.

    Override the ControlTemplate for the ComboBox and set the Placement to Top for the Popup.