PhysicalStoragePage: In the sr_PropertyChanged event handler we need to invoke the refresh function on the UI thread, to avoid cross thread operation exception.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Merge pull request #139 from MihaelaStoica/xs64bit

PhysicalStoragePage: In the sr_PropertyChanged event handler we need to ...