The TVM_SETITEM sets some or all of a tree-view item’s attributes. You can send this message explicitly or by using the TreeView_SetItem macro.
TVM_SETITEM wParam = 0; lParam = (LPARAM) (const TV_ITEM FAR*) pitem;
If mask specifies the TVIF_TEXT value, the pszText member is the pointer to a null-terminated string and the cchTextMax member is ignored.
If mask specifies the TVIF_STATE value, the stateMask member indicates which item states to change and the state member contains the values for those states.
Returns TRUE if successful or FALSE otherwise.