Set which items are shown when combobox is selected. (WPF)

Question

Hello everyone,
I'm currently working on a WPF project and was wondering if it is possible to set which items are shown when I open the combobox. At the moment it always shows the items that are in the middle of all.
Like:
"item 1"
"item 2"
"item 3"
"item 4"
"item 5"
"item 6"
"item 7"
In this example only item 3 to 5 would show when clicking the combobox. But I would like to show item 1 at the very top instead of item 3. Is there any way to get that to happen? Its's kinda hard to describe it. I hope you understand it anyway ;)

Have a nice day everyone!

Answer 1

Yes I know that, but that doesn't help with my problem. My problem is, that if I click on the combobox, the dropdown menu doesn't start at the top, but at the bottom. That is little bit different than my original question. Figured it out when I already posted the question.