Calling an ElementMethod in a DataTrigger

Question

I have a TextBox thats using this Style. I need to add a Focus() method to in this style.
So that when the TextBox is Visible and the ValidParent Property is false then i call the Focus() method on that TextBox

<Style x:Key="ParentTextBoxStyle" TargetType="{x:Type TextBox}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding Path=ValidParent }" Value="false">
            ...
        </DataTrigger>
        <DataTrigger Binding="{Binding Path=ValidParent }" Value="false">
            <Setter Property="BorderBrush" Value="Red"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

Is this possible ?? And if it is then if i had multiple textboxes with the same behaviour which one will recieve Focus?? Does the Order of the Controls in my Xaml make a diffrence then ??
Thank you

Answer 1

You cannot call methods via style triggers. Using Interactivity from the Blend SDK you have more options, including method calls but they cannot be easily used in styles.