diff --git a/Machining/DemoUseMachiningProject.cs b/Machining/DemoUseMachiningProject.cs
index 4e1aa71..47ed66e 100644
--- a/Machining/DemoUseMachiningProject.cs
+++ b/Machining/DemoUseMachiningProject.cs
@@ -50,7 +50,7 @@ public static class DemoUseMachiningProject
 			};
 		Console.WriteLine($"Set machining step event.");
 		//show MRR.
-		localProjectService.RuntimeApi.SessionStepBuilt += (preStep, curStep) =>
+		localProjectService.SessionShell.SessionStepBuilt += (preStep, curStep) =>
 			{
 				var sourceCommand = curStep.SourceCommand;
 				var indexedFileLine=sourceCommand?.GetSentence()?.FirstIndexedFileLine;
@@ -65,13 +65,13 @@ public static class DemoUseMachiningProject
 
 		Console.WriteLine($"Session begin.");
 		localProjectService.BeginSession();
-		localProjectService.RuntimeApi.MachiningResolution_mm = 1;
-		localProjectService.RuntimeApi.EnableCollisionDetection = true;
-		localProjectService.RuntimeApi.EnablePauseOnFailure = false;
-		localProjectService.RuntimeApi.EnablePhysics = false;
+		localProjectService.SessionShell.MachiningResolution_mm = 1;
+		localProjectService.SessionShell.EnableCollisionDetection = true;
+		localProjectService.SessionShell.EnablePauseOnFailure = false;
+		localProjectService.SessionShell.EnablePhysics = false;
 		//the path from Shell-API is relative by project directory. 
-		localProjectService.RuntimeApi.PlayNcFile("NC/side.ptp");
-		localProjectService.RuntimeApi.PlayNcFile("NC/circle.ptp");
+		localProjectService.SessionShell.PlayNcFile("NC/side.ptp");
+		localProjectService.SessionShell.PlayNcFile("NC/circle.ptp");
 		localProjectService.EndSession();
 		Console.WriteLine($"Session end.");
 		#endregion