I still have no idea what is the root cause here (why the accellerators do not
work 'automagically') - I suspect it is because we don't have a shell there,
and instead only a vcl::Window, or something like that :-)

Either way, when we handle the accellerators already in PreNotify(), it works
as expected, so let's live with that for the time being.

Change-Id: Id050fd8f5fff38914821cb64eaa3ae7281fc6d50