Hi Christian.

>> I use a combobox where the user can enter a value or select from a list of values in the list.
I want to trigger a method when the user selected an item from the list, but I cannot use the InteractiveChange even for this, because this would also trigger when the user enters a value into the combobox.
So far I could not find an even for this, how should I do this? <<

You mean you want to trigger the event only when the user has not typed in a new value? You can do this in the valid:

IF This.ListIndex = 0 AND !EMPTY( This.DisplayValue )
   *** The user type in a new item that is not in the list
ELSE
   *** Trigger your method here
ENDIF

Marcia