property Items.NextSiblingItem (Item as HITEM) as HITEM

Retrieves the next sibling of the item in the parent's child list.

TypeDescription
Item as HITEM A long expression that indicates the item's handle.
HITEM A long expression that indicates the handle of the next sibling item.

Use ItemChild and NextSiblingItem properties to scan the collection of child items. 

The following sample shows how to scan recursively all child items hosted by an item: 

Sub RecItem(ByVal g As EXPLORERTREELibCtl.Group, ByVal h As EXPLORERTREELibCtl.HITEM)
    If Not (h = 0) Then
        Dim hChild As HITEM
        With g.Items
            Debug.Print .CellCaption(h, 0)
            hChild = .ItemChild(h)
            While Not (hChild = 0)
                RecItem g, hChild
                hChild = .NextSiblingItem(hChild)
            Wend
        End With
    End If
End Sub