Tiles error : "Cannot add direct child without default aggregation"

Hi all ,

I'm trying to build ( XML View )  icon tab  with 2 tabs :

1. Standard tile

2. Generic tile

when I combine the above two classes i get the error mesage :

"Uncaught Error: Cannot add direct child without default aggregation defined for control sap.suite.ui.commons.GenericTile"

I guess it's related to the different tile classe.

Please advise.