Simultaneous animation
<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'> <UserControl.Resources> <Storyboard x:Name="storyboard" Storyboard.TargetName="cmdGrow" FillBehavior="Stop"> <DoubleAnimation Storyboard.TargetProperty="Width" To="300" Duration="0:0:2" FillBehavior="HoldEnd"></DoubleAnimation> <DoubleAnimation Storyboard.TargetProperty="Height" To="300" Duration="0:0:5"></DoubleAnimation> </Storyboard> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <Button x:Name="cmdGrow" Width="160" Height="30" Click="Button_Click" Content="This button grows"></Button> </Grid> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { storyboard.Begin(); } } }