Select all stems for only one voice

Selecting all similar head notes for a single voice is ok :
select head note > right clic > select > more > same voice > ok

But the same operation with the stems don't work : when i want to select all stems of the same voice (select the firts stem > right clic > select > more > same voice), all the stems of all the voices are selected.

win7 familial edition SP1
MuseScore Nighlty 3d949ac