Hi Ulrich,
Thanks for your update.
We have added “Support for auto resizing popup based on the ContentTemplate” in our feature request lists.
We usually plan and work on the features based on the priority and demand for the feature from our customers. For the 2018 Volume 3 main release, we have targeted support for bubble headed popup, addition of two more animations to the popup and run time support for PopupView’s size change based on the PopupView.HeightReqeust and PopupView.WidthRequest, which have higher traction and requests among our customers right now.
So, the support for auto resizing popup based on the ContentTemplate will be available in any of our upcoming release, please check the release notes on the Syncfusion web site, to track the support and availability of the feature.
Regards,
Suhasini