//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(); this.Loaded += new RoutedEventHandler(MainPage_Loaded); btnGrow.SizeChanged += new SizeChangedEventHandler(btnGrow_SizeChanged); } void btnGrow_SizeChanged(object sender, SizeChangedEventArgs e) { if (btnGrow.ActualWidth == 300) { btnGrow.Content = "This button now shrinks"; } } void MainPage_Loaded(object sender, RoutedEventArgs e) { Grow.Begin(); } } }