public void CloseShowsPreviouslyVisibleControl()
{
workspace = new DeckWorkspace();
MockSmartPart c1 = new MockSmartPart();
MockSmartPart c2 = new MockSmartPart();
workspace.Show(c1);
workspace.Show(c2);
workspace.Close(c2);
Assert.AreSame(c1, workspace.ActiveSmartPart);
}