Find Extensions NetworkAnalys

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I'm using arcgis 10.0
My code:
IAoInitialize init = new AoInitializeClass();
var a= init.IsExtensionCodeAvailable(esriLicenseProductCode.esriLicenseProductCodeEngine,esriLicenseExtensionCode.esriLicenseExtensionCodeNetwork);
//a==true
IExtensionManager extensionManager = m_hookHelper2.ExtensionManager;

UID networkAnalys= new UIDClass();
guid.Value = "esriEditorExt.UtilityNetworkAnalysisExt";
UID spatial = new UIDClass();
pUid.Value = "esriSpatialAnalystUI.SAExtension";


IExtension extensionspatial = extensionManager.FindExtension(spatial);
//This Ok, extensionspatial !=NULL
IExtension extensionnetwork = extensionManager.FindExtension(networkAnalys);
//Can't get this extension, extensionnetwork ==NULL
How I can get it



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