property Items.ItemChild (Item as HITEM) as HITEM

Retrieves the first child item of a specified item.

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

If the ItemChild property gets 0, the item has no child items. Use this property to get the first child of an item. NextVisibleItem or NextSiblingItem to get the next visible, sibling item. 

The following snippet of code shows how to recursively scan all child items in the group: 

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