gistfile1.xml

<UserControl x:Class="ColourLab.IndividualColourView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="controlRoot">
	<StackPanel>
		<StackPanel.Triggers>
			<EventTrigger RoutedEvent="StackPanel.MouseEnter">
				<BeginStoryboard Name="GoUp" HandoffBehavior="Compose">
					<Storyboard>
						<Int32Animation Storyboard.TargetName="controlRoot" Storyboard.TargetProperty="ColourWidth" To="100" Duration="0:0:0.6" 
                                        AccelerationRatio="0.1" DecelerationRatio="0.9" />
					</Storyboard>
				</BeginStoryboard>
			</EventTrigger>
			<EventTrigger RoutedEvent="StackPanel.MouseLeave">
				<BeginStoryboard Name="GoDown" HandoffBehavior="Compose">
					<Storyboard>
                        <Int32Animation Storyboard.TargetName="controlRoot" Storyboard.TargetProperty="ColourWidth" To="20" Duration="0:0:1" 
                                        AccelerationRatio="0.9" DecelerationRatio="0.1" >
                        </Int32Animation>
<!--
                        <Int32AnimationUsingKeyFrames Storyboard.TargetName="controlRoot" Storyboard.TargetProperty="ColourWidth">
                            <EasingInt32KeyFrame KeyTime="0:0:2" Value="20">
                                <EasingInt32KeyFrame.EasingFunction>
                                    <BounceEase Bounces="6" Bounciness="12"/>
                                </EasingInt32KeyFrame.EasingFunction>
                            </EasingInt32KeyFrame>
                        </Int32AnimationUsingKeyFrames>
-->
                    </Storyboard>
				</BeginStoryboard>
			</EventTrigger>
		</StackPanel.Triggers>

		<ItemsControl ItemsSource="{Binding Colours}">
			<ItemsControl.ItemsPanel>
				<ItemsPanelTemplate>
					<StackPanel Orientation="Horizontal" />
				</ItemsPanelTemplate>
			</ItemsControl.ItemsPanel>
			<ItemsControl.ItemTemplate>
				<DataTemplate>
					<StackPanel>
						<Rectangle Width="{Binding ElementName=controlRoot, Path = ColourWidth}" Height="20">
							<Rectangle.Fill>
								<SolidColorBrush Color="{Binding .}" />
							</Rectangle.Fill>
						</Rectangle>
					</StackPanel>
				</DataTemplate>
			</ItemsControl.ItemTemplate>
		</ItemsControl>
	</StackPanel>
</UserControl>