WPF Blend 一个动画结束后另一个动画开始执行(一个一个执行)

<!--#region 动画1-->
        <!--#region Border-->
        <Border x:Name="border" BorderBrush="Black" BorderThickness="0" Margin="9.333,8.852,0,0" RenderTransformOrigin="0.5,0.5" HorizontalAlignment="Left" Height="84.814" VerticalAlignment="Top" Width="84.814">
            <Image x:Name="image" Source="Images\u10433.png"/>
            <Border.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform/>
                    <TranslateTransform/>
                </TransformGroup>
            </Border.RenderTransform>
        </Border>
        <!--#endregion-->

        <!--#region border-->
        <Border BorderBrush="Black" BorderThickness="0" HorizontalAlignment="Left" Height="100" Margin="1.555,1.074,0,0" VerticalAlignment="Top" Width="100">
            <Image x:Name="img_FanRotate" Source="Images\u10482.png" RenderTransformOrigin="0.5,0.5" d:IsHidden="True">
                <Image.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Image.RenderTransform>
            </Image>
            <Border.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform/>
                    <TranslateTransform/>
                </TransformGroup>
            </Border.RenderTransform>
        </Border>
        <!--#endregion-->

        <!--#region border-->
        <Border BorderBrush="Black" BorderThickness="0" HorizontalAlignment="Left" Height="100" Margin="1.555,1.074,0,0" VerticalAlignment="Top" Width="100">
            <Image Source="Images\u10435.png" RenderTransformOrigin="0.5,0.5" Width="30" Height="30"/>
        </Border>
        <!--#endregion-->

 　　　　<Button x:Name="button" Content="暂停" HorizontalAlignment="Right" Margin="0,102.926,178.407,0" VerticalAlignment="Top" Width="75" Click="button_Click"/>
        <Button x:Name="button1" Content="开始/继续" Margin="0,156.629,178.407,145.683" Click="button1_Click" HorizontalAlignment="Right" Width="75" d:LayoutOverrides="Height"/>
        <Button x:Name="button2" Content="停止" HorizontalAlignment="Right" Margin="0,0,178.407,97.609" VerticalAlignment="Bottom" Width="75" Click="button2_Click"/>
        <Button x:Name="button3" Content="开始" HorizontalAlignment="Right" Margin="0,54.778,178.407,0" VerticalAlignment="Top" Width="75" Click="button3_Click"/>

        <!--#endregion-->

　　　　 #region 创建故事版
        //创建一个故事版
        Storyboard storyboard = new Storyboard();
        private void CreateStoryboard()
        {
            //定义动画1运行时间==动画2等待时间
            TimeSpan ts = new TimeSpan(0, 0, 1);

            #region 创建第一个动画
            DoubleAnimation doubleAnimation = new DoubleAnimation();
            //目标角度
            doubleAnimation.To = 360;
            //结束时间
            doubleAnimation.Duration = new Duration(ts);
            Storyboard.SetTarget(doubleAnimation, img_FanRotate);
            Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)"));
            storyboard.Children.Add(doubleAnimation);
            #endregion 

            #region 创建第二个动画
            DoubleAnimation doubleAnimation2 = new DoubleAnimation();
            //目标角度
            doubleAnimation2.To = 360;
            //设置等待时间
            doubleAnimation2.BeginTime = ts;
            //结束时间
            doubleAnimation2.Duration = new Duration(new TimeSpan(0, 0, 1));
            //故事版中设置目标
            Storyboard.SetTarget(doubleAnimation2, img_FanRotate2);
            //故事版中设置属性路径
            Storyboard.SetTargetProperty(doubleAnimation2, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)"));
            //将动画添加至故事版末尾
            storyboard.Children.Add(doubleAnimation2);
            #endregion 

            //开始故事版
            //storyboard.Begin();
        }
        #endregion

　　 #region 按钮
        //开始
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            storyboard.Begin(img_FanRotate, true);
            storyboard.Begin(img_FanRotate2, true);
        }

        //暂停
        private void button_Click(object sender, RoutedEventArgs e)
        {
            storyboard.Pause(img_FanRotate);
            storyboard.Pause(img_FanRotate2);
        }

        //继续
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            storyboard.Resume(img_FanRotate);
            storyboard.Resume(img_FanRotate2);
        }

        //停止
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            storyboard.Stop(img_FanRotate);
            storyboard.Stop(img_FanRotate2);
        }
        #endregion