WPF

<Canvas>
    <Button Click="Button_Click">
        Set width to 100
    </Button>
              
    <Button Canvas.Top="30"
        Animate width to 250
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetName="RedRectangle" Storyboard.TargetProperty="Width" To="250" Duration="0:0:1" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Button.Triggers>
    </Button>

    <Rectangle Name="RedRectangle" Width="25" Height="25" Canvas.Top="70" Fill="Red" Stroke="Black" />
</Canvas>

private void Button_Click(object sender, RoutedEventArgs e)
{
    RedRectangle.Width = 100;
}

public class SubControlBase : UserControl {   public static DependencyProperty TitleProperty =            DependencyProperty.Register(                "Title",                typeof(String),                typeof(XceedSubControl), //Do you use SubControlBase here?                new FrameworkPropertyMetadata(                    new PropertyChangedCallback(ChangeTitle)));        public String Title        {            get { return (String)GetValue(TitleProperty); }            set { SetValue(TitleProperty, value); }        }        private static void ChangeTitle(DependencyObject source, DependencyPropertyChangedEventArgs e)        {            (source as XceedSubControl).UpdateTitle((String)e.NewValue);        }        private void UpdateTitle(String Title)        {            SetTitle(Title);        }        public void SetTitle(String title)        {            ControlTitle.Text = title;        }}//class Examplepublic partial class XceedSubControl : SubControlBase{}