DataTrigger setter called only once - wpf

Question

I have this following style. My problem is that even tho multibinding is always true, I am observing setter only once when Window is loaded. Whenever I change Window Height this MyMultiValueConverter is being called I can see it in logs, but not the "<Setter>".
<Style x:Key="SeperatorRectangleStyle" TargetType="Rectangle">
<Setter Property="Width" Value="2"/>
<Setter Property="Height" Value="50"/>
<Setter Property="MinHeight" Value="49"/>
<Style.Triggers>
<DataTrigger Value="True">
<DataTrigger.Binding>
<MultiBinding Converter="{StaticResource myTheMultiValueConverter}">
<Binding RelativeSource="{RelativeSource AncestorType={x:Type Window}, Mode=FindAncestor}" Path="ActualHeight"/>
<Binding RelativeSource="{RelativeSource AncestorType={x:Type Window}, Mode=FindAncestor}" Path="Name"/>
</MultiBinding>
</DataTrigger.Binding>
<Setter Property="Height" Value="{Binding Converter={StaticResource mySeperatorHeightConverter}, ConverterParameter=DataTrigger}"/>
</DataTrigger>
</Style.Triggers>
</Style>
MyMultiValueConverter is:
class TheMultiValueConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
foreach (var i in values)
{
Console.WriteLine("TheMultiValueConverter values" + i);
}
Console.WriteLine("");
return true
}
}
MySeperatorHeightConverter is
class SeperatorHeightConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
Console.WriteLine("!-!- SeperatorHeightConverter: " + parameter);
return 100;
}
}

Answer 1

The problem in your code is that you Bind something to the Height that does not change. That is why the second converter does not get triggered.
See this code:
<Setter Property="Height" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=ActualHeight, Converter={StaticResource mySeperatorHeightConverter}, ConverterParameter=DataTrigger}"/>
This small change makes it so that the SeperatorHeightConverter gets triggered everytime the Window Height changes.