If the menu is opened while area is selected in the entry, the selected area is not shown.
(It is only display and the selection area information does not disappear.)
I think that this is not the expected behavior.
Steps to reproduce the behaviour:

I think the bug here is that the entry does not show the selection unless it has focus.
IMO it should still show the selection but maybe in a somewhat less prominent colour.
We decided that it is wrong to call FocusLost on a focus manager switch.
I鈥檝e got a fix in queue.
Resolved on the develop branch (where it was noticed)