I have 2 different systems a user can choose from. The same screen appears no matter whether the user selects system 1 or 2. However, there is a drop down Item combo box that has 16 items, each numbered 1-16. However, 1-16 should only appear if system 2 is selected. If system 1 is selected, only items 1-5 should appear. I can use IsEnabled, but that doesn't collapse or hide the last 11 items. Is there a way to hide items 6-16 instead of making them just unselectable?