从wp8.1中的视图模型开始一个故事板

Question

我正在研究mvvm架构。我正在尝试运行从视图模型混合制作的动画。我能够在我的视图模型中制作故事板对象。但我无法使用find方法在视图模型类中查找我的故事板名称。告诉我该怎么做。

this is my viewmodel
class MypageViewModel :  INotifyPropertyChanged,IValueConverter
{

    private Visibility advancedFormat = Visibility.Collapsed;

    public  MypageViewModel()
    {
       // CheckedInCommand = new CheckInButtonClick();
        Storyboard sb = new Storyboard();
       // unable to find 
        sb.Begin();
        advancedFormat = Visibility.Visible;


    }

}

////////// mypage.xaml中的故事板      

    <Storyboard x:Name="Storyboard1">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.TranslateY)" Storyboard.TargetName="SecondaryGrid">
            <EasingDoubleKeyFrame KeyTime="0" Value="-692.752"/>
            <EasingDoubleKeyFrame KeyTime="0:0:1" Value="0"/>
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>
</Page.Resources>