lResult = SendMessage( 	    // returns LRESULT in lResult 	
   (HWND) hWndControl, 	    // handle to destination control 	
   (UINT) TVM_GETNEXTITEM, 	    // message ID 	
   (WPARAM) wParam, 	    // = (WPARAM) (UINT) flag;	
   (LPARAM) lParam 	    // = (LPARAM) (HTREEITEM) hitem;	
);

##</code><code>##

TVGN_CARET
TVGN_CHILD
TVGN_DROPHILITE
TVGN_FIRSTVISIBLE
TVGN_LASTVISIBLE
TVGN_NEXT
TVGN_NEXTVISIBLE
TVGN_PARENT
TVGN_PREVIOUS
TVGN_PREVIOUSVISIBLE
TVGN_ROOT