android XML view Does not display ToggleButton in Eclipse

Question

In my android XML Graphical Layout, I am unable to display my ToggleButton. I receive some errors (see below). Also, I am not able to edit anything else using the G

Answer 1

Go to your graphical layout and locate the drop down of the API levels, probably you are using the last one 21, and you don´t have it installed, change to other lever according to your app.