Well, since no one answered, then probably most of the people who accessed it don’t either. Studying here the documentation discover that these two files Toolbar.axml and Tabbar.axml they are responsible only for the items that will compose the menu or the top of my App specifically on android, because the menu can edit directly on our mainpage to be applied generally, in which case it will be our main file, the mother of the project, in it we will have the layout and logic part of our application. And the visual part of the mainpage does not have a designer, all the insertion of Abels and other components is done in the nail (via script). I hope I have healed the doubts of those who did not yet have this knowledge.