WPF. How to stop data trigger animation through binding?

Question

In WPF toolkit datagrid I have a data trigger bound to opacity of cell element.

When UpVisibility changes to 1 the path become visible and the animation starts to fade it to 0. Which works.

However my problem now - if I need to prematurely stop/cancel the fading and am setting UpVisibility to 0 the Path is still visible and fading as nothing happened....

How to drop opacity to 0 instantly using MyValue object ?

<Path Data="M 5,0 0,10 10,10" Height="10" Width="10" Fill="Green" Opacity="{Binding MyValue[0].UpVisibility}" Margin="5,0,5,0">
    <Path.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding MyValue[0].UpVisibility}" Value="1.0">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1.0" To="0.0" Duration="0:0:10" />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Path.Style> 
</Path>

Answer 1

Have you tried something like this (untested example):

<Path Data="M 5,0 0,10 10,10" Height="10" Width="10" Fill="Green" Opacity="{Binding MyValue[0].UpVisibility}" Margin="5,0,5,0">
    <Path.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding MyValue[0].UpVisibility}" Value="1.0">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1.0" To="0.0" Duration="0:0:10" />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" To="0.0" Duration="0:0:0" />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.ExitActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Path.Style>
</Path>

I set the animation duration to 0 to be instant. And if you don't define the From property you are instructing WPF to start in the current DependencyProperty value, so it will transition smoothly.