CAA 特征树上草图是隐藏状态，但草图里面的直线却显示着！

CATI2DWFFactory_var spWF2DFactOnSketch(spSketch);
double pt1[2] = {0., 0.},
  pt2[2] = {0., 0.},
  pt3[2] = {100., 0.},
  pt4[2] = {0., 100.};
spSketch->OpenEdition();
//创建线
CATISpecObject_var spLine1 = spWF2DFactOnSketch->CreateLine(pt1,pt3);
CATISpecObject_var spLine2 = spWF2DFactOnSketch->CreateLine(pt2,pt4);

CATI2DCurve_var spCurveOnLine1(spLine1);
CATISpecObject_var spPoint1=  spCurveOnLine1->GetStartPoint();
CATISpecObject_var spPoint3=  spCurveOnLine1->GetEndPoint();
CATI2DCurve_var spCurveOnLine2(spLine2);
CATISpecObject_var spPoint2=  spCurveOnLine2->GetStartPoint();
CATISpecObject_var spPoint4=  spCurveOnLine2->GetEndPoint();

spSketch->CloseEdition();// Closes the sketch edition
HideObject(spSketch);//隐藏特征
//将整个Part刷新一次
spSpecPart ->Update();

如上：我在草图中就简单的创建了两条直线，并且在关闭草图后 将草图隐藏 并且刷新Part  。
但是，当我打开CATIA调试时，这创建的两条直线 却显示在空间之中。   
只有当我双击打开该草图，什么也不做然后退出草图，这两条直线就隐藏掉了。

求解释，谢谢！


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