C / C++ / MFC

// Member Variables
extern const CTreeCtrl* m_pSourceTree;
CTreeCtrl m_DestTree;       
HTREEITEM m_hDest;

// Invocation
   TreeTraverse(m_pSourceTree->GetRootItem());

// Problematic function
TREEITEM CKleenCachePage::TreeTraverse(HTREEITEM hStart) 
{
    HTREEITEM theItem;

    if ( hStart == NULL )
        return NULL;

    if( m_pSourceTree->GetParentItem(hStart) == NULL)   
        m_hDest= NodeCopy(hStart,NULL);     // Creating the root node   

    if ((theItem = m_DestTree.GetChildItem(hStart)) != NULL)
    {   
        m_hDest = NodeCopy(theItem,m_hDest);
        theItem = TreeTraverse(theItem);
        if (theItem != NULL)
            return theItem;
    }

    if ((theItem = m_DestTree.GetNextSiblingItem(hStart)) != NULL)
    {
        m_hDest = NodeCopy(theItem,m_hDest);
        theItem = TreeTraverse(theItem);
        if (theItem != NULL)
            return theItem;
    }
    return theItem;
}
<BR>
HTREEITEM CKleenCachePage::NodeCopy(HTREEITEM hSource, HTREEITEM hDest)
{
    int nImage = 0, nSelectedImage = 0;
    CString csText = m_pSourceTree->GetItemText(hSource);
    m_pSourceTree->GetItemImage(hSource,nImage, nSelectedImage);
    return m_DestTree.InsertItem(csText,nImage,nSelectedImage,hDest,TVI_LAST);
}