Set DataContext for StackPanel
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
DataContext="{Binding ElementName=scroll}">
<ScrollBar Name="scroll"
Orientation="Horizontal" Margin="24"
Minimum="1" Maximum="100" LargeChange="10" SmallChange="1" />
<Label HorizontalAlignment="Center"
Content="{Binding Path=Value, Mode=OneWay}" />
<Button HorizontalAlignment="Center" Margin="24"
FontSize="{Binding Path=Value, Mode=OneWay}">
Bound Button
</Button>
</StackPanel>
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