I created a utility to speed up the initial legwork when creating new screens. One of the most repetitive motions is having to manually type out the "var _foo = mywindow.findChild("_foo");" lines every time you create a new screen, and this utility does that legwork for you. Once installed a new option is added to the context menu in the screen list (System > Design > Screens), right click on a screen and select "Extract Widget Names":
Clicking this will open a new window with the generated var statements in a text box ready for you to copy to your clipboard, as shown in this example from the Time & Expense package:
For reference I added a comment at the end of each line to indicate the widget class.
Hope this helps someone!