public class ControlTouchTracker
{
    private List<FrameworkElement> controls = new List<FrameworkElement>();
    private Dictionary<FrameworkElement, ControlRegion> controlBounds = new Dictionary<FrameworkElement, ControlRegion>();

    public ControlTouchTracker(FrameworkElement rootElement)
    {
        rootElement.LayoutUpdated += this.OnLayoutUpdated;
    }

    public void RegisterControl(FrameworkElement control)
    {
        controls.Add(control);
    }

    public void RemoveControl(FrameworkElement control)
    {
        controls.Remove(control);
        controlBounds.Remove(control);
    }

    private void OnLayoutUpdated(object sender, EventArgs e)
    {
        foreach (Control control in this.controls)
        {
            this.RefreshControlBounds(control);
        }
    }

    private void RefreshControlBounds(FrameworkElement control)
    {
        if (control.Visibility == Visibility.Visible)
        {
            GeneralTransform controlTransform = control.TransformToVisual(Application.Current.RootVisual);
            Point offset = controlTransform.Transform(new Point(0, 0));

            this.controlBounds[control] = new ControlRegion
            {
                Left = (float)offset.X,
                Right = (float)(offset.X + control.ActualWidth),
                Top = (float)offset.Y,
                Bottom = (float)(offset.Y + control.ActualHeight)
            };
        }
        else
        {
            if (this.controlBounds.ContainsKey(control))
            {
                this.controlBounds.Remove(control);
            }
        }
    }

    public bool TouchesControl(Vector2 touchPosition)
    {
        foreach (ControlRegion region in this.controlBounds.Values)
        {
            if (touchPosition.X >= region.Left && touchPosition.X <= region.Right &&
                touchPosition.Y >= region.Top && touchPosition.Y <= region.Bottom)
            {
                return true;
            }
        }

        return false;
    }

    public class ControlRegion
    {
        public float Left { get; set; }
        public float Right { get; set; }
        public float Top { get; set; }
        public float Bottom { get; set; }
    }
}

if (TouchPanel.IsGestureAvailable)
{
    if (TouchPanel.ReadGesture().GestureType == GestureType.Tap)
    {
        if (TouchPanel.ReadGesture().Position == new Vector2(120, 120))
        {

        }
    }
}