/// <summary>
/// Subscribes to CompositionTarget.Rendering event.
/// </summary>
protected void SubscribeToRenderingEvent()
{
RenderingEventManager.AddListener(renderingEventListener);
}
/// <summary>
/// Unsubscribes the CompositionTarget.Rendering event.
/// </summary>
protected void UnsubscribeRenderingEvent()
{
RenderingEventManager.RemoveListener(this.renderingEventListener);
}
