GoogleMap panel resize

I have moved to the new tutorial http://ift.tt/1TyudlH
Mapfragment1 is inside a panel and has horizontal and vertical anchor to BOTH so it fill the entire panel (in the designer)
I can in the code move the panel, but if I just resize it, the map does not resize.
Where I'm wrong ?

from B4X Community - Android, iOS, desktop, server and IoT programming tools http://ift.tt/2cbvIGe
via IFTTT