Get selected lines from SelectionBox (PropertyManagerPage)

Could anyone point me in the right direction?  I've setup a selection box in my property manager page:

            'SELECTED LINE SelectionBox ------------------------------------------------------------
            ID = ID_SELLINEBOX
            controlType = swControlType_Selectionbox
            caption = "Select layout lines for wall insertion"
            alignment = swControlAlign_Indent
            options = swControlOptions_Visible + swControlOptions_Enabled
            tip = "Specify the stud type"
            Set swControl = m_Group1.AddControl(ID, controlType, caption, alignment, options, tip)
            If Not swControl Is Nothing Then
                Set m_SelLineBox = swControl
                m_SelLineBox.Height = 50
                m_SelLineBox.AllowSelectInMultipleBoxes = True
                m_SelLineBox.SetSelectionFilters (swSelEXTSKETCHSEGS)
                m_SelLineBox.Style = swPropMgrPageSelectionBoxStyle_MultipleItemSelect

            End If

How do I get the selection lines out of the propertymanagerpage?  I tried:

          Dim sellines() As Object (or As SldWorks.SketchSegments

          sellines = m_SelLineBox.GetSelectedItems

But it just stops at the "selines =" lines (no error, just stops!!).  Anyone know how to get the selected lines out??? 

Thanks,

Doug

SolidworksApi macros