Is it possible to use Triggers on Grid RowDefinitions?

Question

I have a grid whose rows need to be resized dynamically based on the view model. I\'d like to do something like the following:

Answer 1

I think the only problem with your Xaml code is that you're overwriting the DataTrigger by setting Height explictly on the RowDefinition. Try with using a Setter instead

<RowDefinition>
    <RowDefinition.Style>
        <Style>
            <Setter Property="RowDefinition.Height" Value="2*"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=ShowSection}" Value="True">
                    <Setter Property="RowDefinition.Height" Value="2*"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=ShowSection}" Value="False">
                    <Setter Property="RowDefinition.Height" Value="0"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </RowDefinition.Style>
</RowDefinition>

Answer 2

I know this post is 3 years old, but still it might help someone.

<RowDefinition>
    <RowDefinition.Style>
        <Style TargetType="RowDefinition">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=ShowSection}" Value="True">
                    <Setter Property="Height" Value="2*"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=ShowSection}" Value="False">
                    <Setter Property="Height" Value="0"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </RowDefinition.Style>
</RowDefinition>

I was in same situation, i managed to get it working by setting TargetType to RowDefinition.