I have an assembly and I want to find all the parts in it that have assigned mass properties via API. I know it has assigned mass parts, but they do not show up with this code:

Sub AssignedMassProperties()

Dim swApp As SldWorks.SldWorks

Dim swModel As SldWorks.ModelDoc2

Dim swSelMgr As ISelectionMgr

Dim swComp  As SldWorks.Component2

Dim swCompModel As ModelDoc2

Dim swGroup As Variant

Dim swMass As SldWorks.MassProperty

Set swApp = GetObject(, "SldWorks.Application")

Set swModel = swApp.ActiveDoc

Set swSelMgr = swModel.SelectionManager

swGroup = swModel.GetComponents(False)

For i = 0 To swModel.GetComponentCount(False) - 1

    Set swComp = swGroup(i)

    If swComp.IsHidden(True) = False Then

        Set swCompModel = swComp.GetModelDoc2

        Set swMass = swCompModel.Extension.CreateMassProperty

        If swMass.UserAssigned = True Then

            Debug.Print swComp.Name

        End If

    End If

    Debug.Print swComp.Name

Next i

End Sub

All the forums I have looked through, this method has seemed to work for them but its is not showing anything for me. I have Solidworks 2012. Any help is appreciated. Thanks