The GetFocusedElement method return the currently focused element during the execution of the method. If the return value is null, it means there is no element is being focused. Perhaps the focus has already been lost or the control is disabled.

Do you mind providing us with a simple runable sample? This way we could try to replicate and analyse the issue further. 

hmmm what is strange is that the users clicks on the Save button to get to this point. Shouldn't the save button still have the focus at this point?

Bill

Based on the first post, the GetFocusedElement API is invoked from the CloseCurrentWindow method. Does the save button click handler is set to the CloseCurrentWindow method? if not perhaps there is some earlier method that could cause the save button to lost focus. Do you mind providing us a simple runnable sample so we could invetigate the issue further?