Network HB initially shown as error because it takes time for the status to be
read from xha by xapi. This adds a delay to allow the status to be updated
before XC displays it.
Implemented a generic mechanism to allow tab pages to unregister their event handlers when they are hidden (when a tab page gets deselected)
Also changed VMStoragePage to derive from BaseTabPage, so it could use the same mechanism.
Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
NewAction to use the Action<ActionBase> delegate instead of EventHandler. Thus
there is no need to fire them with Empty or null EventArgs and on several occasions
we avoid casting objects in the event handlers.
Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
