static WinFormsGraphController()
{
_emptyReadOnlyList = new List <IHitTestObject>().AsReadOnly();
// register here editor methods
LayerController.RegisterEditHandlers();
XYPlotLayer.PlotItemEditorMethod = new DoubleClickHandler(EhEditPlotItem);
TextGraphic.PlotItemEditorMethod = new DoubleClickHandler(EhEditPlotItem);
TextGraphic.TextGraphicsEditorMethod = new DoubleClickHandler(EhEditTextGraphics);
}