Finding an item in TreeCtrl (recursive function)

HTREEITEM CTreeCtrlX::FindData(HTREEITEM hti, DWORD dwData)
{
	if(hti == NULL) return NULL;		
	if(GetItemData( hti ) == dwData)
        {
		Select( hti, TVGN_CARET);
		EnsureVisible( hti );			
                return hti;
        }

	hti = GetChildItem( hti );	
	do	
	{		
		HTREEITEM hti_res;
		if((hti_res = FindData( hti, dwData)) !=NULL )
		       return hti_res; 

	}while( (hti = GetNextSiblingItem( hti )) != NULL );		
	return NULL;
}