Erel, Thanks. Deleting the following code line it works!!!!.
B4XFloatTextField1.NextField = txtContrasena
In this 4 weeks, that I dive into the B4A programming language, I realize that it can be improved, to make life more easier for programmer that has full experience in Vb.net.
For example, I suggest that B4A, should contain one command, just to enable/disable it.
In Addition, do you have a tutorial more detailed for XUIViews, that explain with more specific, each property or methods of B4XFloatTextField?. Well, I mean, all the objects contained in XUIViews.
Thanks a lot!.
PS. I hope not to be rude with my comment!.