AnimationDeveloperSamples.MapGraphicTrackPropPage.Apply C# (CSharp) Method

        public void Apply()
        {
            IAGAnimationTrackExtensions trackExtensions = (IAGAnimationTrackExtensions)targetTrack;
            IMapGraphicTrackExtension trackExtension;
            if (trackExtensions.ExtensionCount == 0) //if there is no extension, add one
            {
                trackExtension = new MapGraphicTrackExtension();
                trackExtensions.AddExtension(trackExtension);
            }
            else
            {
                trackExtension = (IMapGraphicTrackExtension)trackExtensions.get_Extension(0);
            }

            trackExtension.ShowTrace = propPage.CheckBoxShowTrace.Checked;
        }