Well, as no one answered, then probably most people who accessed it also do not know. Studying here the documentation find out that these two files Toolbar.axml and Tabbar.axml they are only responsible for the items that will compose the menu or the top of my App specifically in android, since the menu we can edit directly on our mainpage to be applied in general, that in this case 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 labels and other components is all done nail (via script). I hope I have healed the doubts of those who did not yet have this knowledge.