Android Question Panel corner radius (panel inside a panel)

Hi All.
I need to round one side of a panel, however it bug and is ignored.
here is what i need make


Note: corner radius is on left and right of white panel.

here is the result of b4a


i made a panel, and inside this panel i put a another green panel, but i dont know why the corner radius dont works on the left, where is my green panel.



how can i fix this on b4a?
why the corner radius of a panel is ignored when u have another view inside ?

thx all.