I think that I misunderstood. You want the Form property in B4A?
This is what I get in B4A:
(MyMap) {defaultcolor=-984833, activity=anywheresoftware.b4a.BALayout{6f173c6 V.E...... ......ID 0,0-1080,1584 #1}, ba=anywheresoftware.b4a.BA@738cf87, eventName=currencies, ItemsHighlightedTextColor=-13862400, customType=b4a.example3.minisearchview, csType=Dbasic.Designer.MetaCustomView+CustomDataGrid, ItemsBackgroundColor=-1, ItemsTextColor=-16777216, shortType=MiniSearchView, type=}
B4J:
(MyMap) {ItemsHighlightedTextColor=0x2c7a00ff, customType=b4j.example.minisearchview, BooleanExample=true, csType=Dbasic.Designer.MetaCustomView+CustomDataGrid, ItemsBackgroundColor=0xffffffff, ItemsTextColor=0x000000ff, shortType=MiniSearchView, TextColor=0xffffffff, type=, Form=anywheresoftware.b4j.objects.Form@5f2aca39}
If you don't see Form then you are probably loading the layout to a pane that wasn't added to any form.