SuperMap.WindowsPhone.Mapping.Map.OnManipulationStarted C# (CSharp) Method

        protected override void OnManipulationStarted(ManipulationStartedEventArgs e)
        {
            base.OnManipulationStarted(e);

            //if (this.Action != null)
            //{
            //    this.Action.OnManipulationStarted(e);
            //}
            _center = this.TransformToVisual(layerCollectionContainer).Transform(e.ManipulationOrigin);
            _centerP = this.ScreenToMap(_center);
        }