Major Description
If you use DesktopApplicationContext.createDisplay to create a new OS window, and you want to handle keystrokes sent to that window, the only way your key listener will get called is if there is a focused Pivot component in that window. But not all interesting windows contain a focusable component, and even when they do, there are often good reasons not to focus a particular component by default. Meanwhile, if Pivot's notion of the currently focused component is in a different OS window, keystrokes will go there, even though it's not the window that appears to the user to have focus (as judged by the native window system focus decoration), which is counterintuitive.
There is extensive discussion at http://apache-pivot-users.399431.n3.nabble.com/KeyListeners-on-ImageView-td2600622.html