Two way data binding between Slider and ProgressBar
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<StackPanel>
<ProgressBar Width="200" Height="100" x:Name="progress" Value="30" HorizontalAlignment="Center" Margin="10"/>
<Slider Value="{Binding ElementName=progress, Path=Value, Mode=TwoWay}" Minimum="0" Maximum="100" Margin="10"/>
</StackPanel>
</UserControl>
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