Thanks for the answer Enrique,
Well, I just looked at the XUI Views example from Erel. Honestly, I'm still trying to understand the principle...
In the end, I guess I will have to create my own version of a "calendar view with picker functionality". This means reinventing and implementing all the controls, the label matrix for the days of the month and the logical date functions in the programme itself from scratch, piece by piece. A class for this does not seem to exist. What a pity.