Private Sub Form_Load()
    Dim objApp As SolidEdgeFramework.Application
    Dim objDoc As SolidEdgePart.PartDocument
    Dim objBody As SolidEdgeGeometry.Body
    Dim objEdges As Object
    Dim objCircEdge As SolidEdgeGeometry.Edge
    Dim objCircle As SolidEdgeGeometry.Circle
    Dim objParent As SolidEdgeGeometry.Edge
    Const TESTFILE = "T:\vbtests\testcases\Curve3d.par"
    ' Report errors
    Const PI = 3.14159265358979
    ' Create/get the application with specific settings
    On Error Resume Next
    Set objApp = GetObject(, "SolidEdge.Application")
    If Err Then
        Err.Clear
        Set objApp = CreateObject("SolidEdge.Application")
        Set objDoc = objApp.Documents.Add("SolidEdge.PartDocument")
        objApp.Visible = True
    Else
        Set objDoc = objApp.ActiveDocument
    End If
    ' Open the TestFile
    Set objDoc = objApp.Documents.Open(TESTFILE)
    ' Get the Model object
    Set objBody = objDoc.Models(1).Body
    ' Get Edges Collection object
    Set objEdges = objBody.Edges(EdgeType:=igQueryAll)
    ' Get a Circular Edge
    Set objCircEdge = objEdges(16)
    ' Get the Circular Curve
    Set objCircle = objCircEdge.Geometry
    ' Get the Parent property
    Set objParent = objCircle.Parent
    ' USER DISPLAY
    ' Release objects
    Set objApp = Nothing
    Set objDoc = Nothing
    Set objBody = Nothing
    Set objParent = Nothing
    Set objCircEdge = Nothing
    Set objEdges = Nothing
    Set objCircle = Nothing
End Sub