FireMonkey TFrames hierarchy not working on TForm

It worked to create a hierarchy of TFrames (TMenuFrame <- TBaseFrame <- TEmptyFrame) and add them to the Palette.

It worked to add thew TMenuFrame to my Form (the first time), but after closing and re-opening the project again it did not worked anymore. During opening it complains over property MenuFrame.Size.Width does not exist, and some more properties following the Frame hierarchy.

• Is this a bug or should it not work?
• Is there a workaround?

The second time around, when trying to add TMenuFrame or TBaseFrame I get an errordialog with "Cannot paste form or datamodule into another form or datamodule". Adding the TEmptyForm is the only one that works.

Is this a Bug in Delphi Berlin upd 1 or should it not work?

Thanks
Jan Blomqvist