- First, rename the item. You can do this by just adding an extra letter ("x" for example) to the end of the name.
- Run your app.
If you get no compile errors, then the item is not being used and can be deleted.
There are some exceptions to this. If the item is a window or webpage and you don't refer to it in code but it is selected as the default Window or WebPage, renaming it won't cause an error. The same holds true for menubars. However, these are items you almost certainly know are in use anyway.