VisualStateManager question: where is the complete event?

Ok, I finally get used with the expression + vs 2008 for animation. (Thanks caperaven! http://silverlight.net/forums/p/17571/59182.aspx#59182) Now I am trying to find a way to hide some controls after they fade out. I tried to find a storyboard object from where I can wire up a complete event but stuck at the first step: I used the following code in my control's constructor after the InitializeComponents():
            Collection<VisualStateGroup> vsgs = VisualStateManager.GetVisualStateGroups(this);
            foreach (var vsg in vsgs)
            {
                if (vsg.Name == "common_states")
              &nb ...