void ISlidePageController.Close(SlidePage slide_page)
{
(slidePageFrame.FindResource("slideOut") as Storyboard).Begin();
SlidePage = null;
}
void ISlidePageController.Show(SlidePage slide_page)
{
SlidePage = slide_page;
slidePageFrame.Navigate(slide_page);
(slidePageFrame.FindResource("slideIn") as Storyboard).Begin();
}