Thanks! But as I use the WinForms control now (and will probably stay with it), the fix is not relevant for us ;-).
The reason to use a WPF control on an ElementHost: WinForms seems to be a bit obsolete, and one day we will have to migrate to WPF or something better. So, if we add a new UI component to our WinForms apps we try to use WPF if possible - this avoids a future migration to WPF.
Best regards
Wolfgang