Sorry, that's a mistake in the source code file. The three files are in the Files folder of the project but they are not added in the Files Tab. The are displayed when running the program because they are in the projects Files folder but they don't appear in the Designer because they are not added in the Files Tab.In the 'Menu' example, going to the Designer shows the Main layout as well as those for the Pages (1, 2, and 3). For the other two examples (tabhost view and button toolbox) the designer only lists the Main view even though the code used the Page1, 2, and 3 layouts and I can see them displayed when the program is run on the emulator. Where do the Page layout files exist or where can they be seen in those later two examples.