Animation in wp8.1

Question

Hello every one

i have a problem with writing animation to widows phone 8.1

when i was writing to windows phone 8.0, i used the follow XAML code and it work perfectly

  <Storyboard x:Name="settingPanelStorybord">
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetName="settingPanel" Storyboard.TargetProperty="Height">
                             <EasingDoubleKeyFrame   Value="30" KeyTime="00:00:00">
                                <EasingDoubleKeyFrame.EasingFunction>
                                    <CubicEase EasingMode="EaseOut"/>
                                </EasingDoubleKeyFrame.EasingFunction>
                                </EasingDoubleKeyFrame>

                                <!-- This keyframe animates the ellipse back down and makes it bounce. -->
                                <EasingDoubleKeyFrame  Value="800" KeyTime="00:00:0.6">
                                    <EasingDoubleKeyFrame.EasingFunction>
                                        <SineEase EasingMode="EaseIn"></SineEase>
                                    </EasingDoubleKeyFrame.EasingFunction>
                                </EasingDoubleKeyFrame>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>

i used a few animations in my app, and this is the only one that doesn't work.

any one know what the problem here?

the app is running and the stackPanel is showed but without the animation... (and yes

settingPanelStorybord.Show();

is execute

thanks alot,

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