AnnUndoEnable Example for Delphi

var
//Global declarations
RasterAnn: LEADRasterAnnotation;
RasterAnnToolbar: LEADRasterAnnToolBar;

procedure TForm1.Button1Click(Sender: TObject);
begin
   RasterAnn:= CoLEADRasterAnnotation.Create ();
   RasterAnnToolbar:= CoLEADRasterAnnToolBar.Create ();
   RasterAnn.AnnParentRasterView := LEADRasterView1.Raster;
   RasterAnnToolbar.AnnParentRasterView := LEADRasterView1.Raster;
   LEADEventSink1.Connect (RasterAnn, _LEADRasterAnnotationEvents);
   RasterAnn.AnnUserMode:= ANN_USERMODE_DESIGN;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
   //This example sets the annotation undo depth to 10 and
   //enables the annotation undo capability
   RasterAnn.AnnUndoEnable:= True;
   RasterAnn.AnnUndoDepth:= 10;

end;