Android Question Panel border radius and elevetation not work

Hi.

B4X:
Dim mbase As Panel

...

Dim cd As ColorDrawable
cd.Initialize2( Colors.White, 10dip, 0, 0 )
mBase.Background = cd

mBase.Elevation = 10dip
What happens when I try to put border radius and elevation on a panel don't work. I can only use one of the two, they don't work together.
 
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