Several MultiDataTriggers works only for the last one

Question

In a UserControl I have a DP of type enum (GroupStyle of type eGroupStyle) and a DP of type bool (IsGrouped). I need to begin some storyboard in all possible conditions. But the last MultiDataTrigger works only. Where did I wrong? Also I'd like to know whether a simpler way exists to factor these conditions. (checking IsGrouped once.)

C#:

enum eGroupStyle
{
    GroupStyle1,
    GroupStyle2,
    ∙∙∙,
    GroupStyleN,
}

XAML:

<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyle1"/>
        <Condition Binding="{Binding IsGrouped}" Value="False"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToUnselectedStyle1}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>
<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyle1"/>
        <Condition Binding="{Binding IsGrouped}" Value="True"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToSelectedStyle1}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>
<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyle2"/>
        <Condition Binding="{Binding IsGrouped}" Value="False"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToUnselectedStyle2}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>
<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyle2"/>
        <Condition Binding="{Binding IsGrouped}" Value="True"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToSelectedStyle2}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>
∙∙∙
<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyleN"/>
        <Condition Binding="{Binding IsGrouped}" Value="False"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToUnselectedStyleN}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>
<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding GroupStyle}" Value="GroupStyleN"/>
        <Condition Binding="{Binding IsGrouped}" Value="True"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard  Storyboard="{StaticResource Storyboard_TurnToSelectedStyleN}"/>
    </MultiDataTrigger.EnterActions>
</MultiDataTrigger>

Answer 1

I found it out! I need to remove the previous storyboard at the exit-action like below. Now it works :)

<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding Path=GroupStyle}" Value="GroupStyle1"/>
        <Condition Binding="{Binding Path=IsGrouped}" Value="False"/>
    </MultiDataTrigger.Conditions>
    <MultiDataTrigger.EnterActions>
        <BeginStoryboard x:Name="BeginStoryboard_TurnToUnselectedStyle1" Storyboard="{StaticResource Storyboard_TurnToUnselectedStyle1}"/>
    </MultiDataTrigger.EnterActions>
    <MultiDataTrigger.ExitActions>
        <RemoveStoryboard BeginStoryboardName="BeginStoryboard_TurnToUnselectedStyle1"/>
    </MultiDataTrigger.ExitActions>
</MultiDataTrigger>