wpfキーフレーム

<Storyboard x:Key="OnExpansion">
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Height" Storyboard.TargetName="grid">
                <EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="100"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>