I had one solution that worked. Frist of all, i organizaed my nodes, second, instead of creating widget from other widgets, i create them using the gamemode class, not using Level Blueprint for nothing.
I´ve figured it out from the logic of parent and child between UMG, (i don´t know if i am right), when you create a widget from another widget, it turns out a child, and if you want to set the parent, you need to set the widget as a variable (promote to variable).
But instead of setting from widgets, i prefer to set using the gamemode class.
But off course, deleting the widget before adding another, it´s important for optimizing.
Thanks.