DataTrigger does not change Text property

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The local value assigned to the TextBlock’s Text property has higher precedence than the value provided by the Setter in the DataTrigger. See Dependency Property Value Precedence for details.

Set the initial Text value by another Setter:

<TextBlock>
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Setter Property="Text" Value="Unclicked"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Clicked,
                                       Source={x:Static Application.Current}}"
                             Value="{StaticResource True}">
                    <Setter Property="Text" Value="Clicked" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

The error message you see when you use the Boolean resource is just the XAML designer complaining. There is no error at runtime.

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