AutoHide Progressbar with StyleTriggers

I would like to hide a progressbar in WPF using databinding. Whenever a property is 0, the progressbar should hide: I try the following code

(Info: My current datacontext is a class that holds an integer property 'CurrentIndex')

<ProgressBar Minimum="0" Maximum="100" Value="{Binding CurrentIndex, UpdateSourceTrigger=PropertyChanged}" Visibility="Visible">
        <Style TargetType="{x:Type ProgressBar}">
                <DataTrigger Binding="{Binding CurrentIndex}" Value="0">
                    <Setter Property="Visibility" Value="Hidden"/>

What is wrong with this code? Why does the progressbar still show up when the CurrentIndex is 0? (in the model behind, the value of 'CurrentIndex' is 0 by default, when the control is loaded)


DP precedence, do not set Visibility on the control itself (local value > style).

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