Thanks for the reply, it works just fine!
I thought I hade looked at all Label properties, but it seems I missed this one :-)
Just one more question, the LabelInterval is not a dependency property right?
I tried to bind it to my ViewModel, since the user can select different intervals in a drop down.
But that generates a binding error saying:
"Object of type 'System.Windows.Data.Binding' cannot be converted to type 'System.Int32'."
Not a big deal, I just have to do it in code behind, but it would have been cleaner to bind it.