diff --git a/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb b/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
index ffc490c..6b15aa4 100644
--- a/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
+++ b/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
@@ -420,7 +420,7 @@ Namespace EgtCAM5
       End Sub
 
       Private Sub ExecSim()
-         EgtSimStart()
+         EgtSimStart(False)
          EgtSimSetStep(SliderValue * m_SliderX)
          Dim nShowDataCounter As Integer = 0
          While m_nStatus <> SIM_ST.ST_STOP