How to wait for state changing transition to finish in Silverlight 4?

Question

I need to change state of a control and then do some action. To be specific, I want to run an animation before a control is hidden. I would like to do something like that:

Answer 1

You can attach a Storyboard.Completed event handler to the Storyboard or attach a VisualStateGroup.CurrentStateChanged event handler to the VisualStateGroup:

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 SilverlightApplication7
{
public partial class MainPage : UserControl
{
    public MainPage()
    {
        // Required to initialize variables
        InitializeComponent();

        this.Loaded += new RoutedEventHandler(MainPage_Loaded);
    }

    void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        VisualStateManager.GoToState(this, "Hidden", true);
    }

    private void OnHidden(object storyboard, EventArgs args)
    {

    }
}

}