WPF

    internal class FSFWindowTaskProvider : PrimarySelectionTaskProvider {

        /// <summary>
        /// Constructor
        /// </summary>
        public FSFWindowTaskProvider() {

        }

        /// <summary>
        /// This function wil be called when a control is selected in WPF window
        /// </summary>
        /// <param name="item">the currently selected control</param>
        protected override void Activate(ModelItem item) {
            ModelService service = Context.Services.GetService(typeof(ModelService)) as ModelService;
            service.ModelChanged += new EventHandler<ModelChangedEventArgs>(service_ModelChanged);
            base.Activate(item);
        }

        private void service_ModelChanged(object sender, ModelChangedEventArgs e) {
            // Get the removed Items from window
            IEnumerable<Microsoft.Windows.Design.Model.ModelItem> enumerator = e.ItemsRemoved;
            foreach (ModelItem mi in enumerator) {
                // Get the name of the control deleted
                MessageBox.Show(mi.Properties["Name"].ComputedValue.ToString() + "deleted");
                string cntrlName = mi.Properties["Name"].ComputedValue.ToString();
                if (string.IsNullOrEmpty(cntrlName)) {
                    continue;
                }
                // Write the clean up code
            }

        }
    }

       internal class Metadata : IRegisterMetadata {
....
 // Primary selection task provider for FSFWindow
                builder.AddCustomAttributes(typeof(myWindow), // mywindow is my custom class
                    new FeatureAttribute(typeof(FSFWindowTaskProvider)));
      } 

   private void service_ModelChanged(object sender, ModelChangedEventArgs e) {
       // Get the removed Items from window
       foreach (ModelItem mi in = e.ItemsRemoved) {
           // Get the name of the control deleted
 if (typeof(MyControl).IsAssignableFrom(mi.ItemType)) {
           // Write the clean up code
}
       }

Member 3981366 wrote:

Now i want to call javascript on button click