public void addInkFeature(InkFeature feature)
{
D.assert(!feature._debugDisposed);
D.assert(feature._controller == this);
this._inkFeatures = this._inkFeatures ?? new List <InkFeature>();
D.assert(!this._inkFeatures.Contains(feature));
this._inkFeatures.Add(feature);
this.markNeedsPaint();
}
public void _removeFeature(InkFeature feature)
{
D.assert(this._inkFeatures != null);
this._inkFeatures.Remove(feature);
this.markNeedsPaint();
}