TVM_SETITEM message

The TVM_SETITEM message sets some or all of a tree-view item's attributes. You can send this message explicitly or by using the TreeView_SetItem macro.

wParam

Must be zero.

lParam

Pointer to a TVITEM structure that contains the new item attributes. With version 4.71 and later, you can use a TVITEMEX structure instead.

Returns TRUE if successful, or FALSE otherwise.

The hItem member of the TVITEM or TVITEMEX structure identifies the item, and the mask member specifies which attributes to set.