Setter With Binding to Slider
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="FontSize"
Value="{Binding ElementName=scroll, Path=Value}" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="Margin" Value="24" />
</Style>
</StackPanel.Resources>
<ScrollBar Name="scroll" Orientation="Horizontal" Margin="24" Minimum="11" Maximum="100" Value="24" />
<Button>
Button Number 1
</Button>
</StackPanel>
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