Thank you,
@lemonisdead and
@Erel.
I tried with the elevation of the panel and it worked. I tough that elevation was only to deal with shadows.
But I noted too that this only occurs in Android 5. In Android 4 it works like ever.
Is there a way to use a flat button, with no elevation at all?
I tried changing the backgroud to a drawable and was the same.
I use B4A mainly to make quizes to my first degree maths, geography and history students. They are all curious about how I make apps so fast.
I tell them that its only possible with b4A. I´m sure some of them will be programmers in the future, thanks to B4A.
The most of my apps are just for me, my daughter, and some friends. The most are games, quizes, ebooks, a lot of calculators, utilities etc.
Unfortunately all of them are in portuguese, but I will internationalize some and share with this fantastic community.
I have only one app published at Google Play, its a dates calculator, using admob. If someone want to try you may search for the publisher name CTD mobile or my name Demasi, so there´s a lot of dates calculator in the play store.
I know that this is not the place to post this, but understand this like a big "THANK YOU" for all the support you all always give me, and this community members.