How to Raise DragDelta event on Thumb
===

As you can see below, I want to start moving when the component visibility changes.
because otherwise I need the user to click again to start the movement, and that is bad in terms of usability for my application.

     public MoveILayoutControl()
        {
            InitializeComponent();
            this.IsVisibleChanged += new DependencyPropertyChangedEventHandler(MoveILayoutControl_IsVisibleChanged);
            this.moveThumb.DragDelta += new DragDeltaEventHandler(MoveThumb_DragDelta);
        }
    
        void MoveILayoutControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (this.IsVisible)
            {
                // Raise Drag Event !?
            }
        }

        private void MoveThumb_DragDelta(object sender, DragDeltaEventArgs e)
        {
            var myData = DataContext as ILayoutVisual;

            if (myData != null)
            {
                Point dragDelta = new Point(e.HorizontalChange, e.VerticalChange);

                if (myData.Rotation != 0)
                {
                    Matrix toCalculate = ((this.Parent as FrameworkElement).RenderTransform).Value;
                    if (toCalculate != null)
                    {
                        dragDelta = toCalculate.Transform(dragDelta);
                    }
                }
                myData.X += dragDelta.X;
                myData.Y += dragDelta.Y;
            }
        }