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Inserts a new item in a tree-view control. You can send this message explicitly or by using the TreeView_InsertItem macro.
Parameters
- 
wParam 
- Must be zero.
- 
lParam 
- 
Pointer to a TVINSERTSTRUCT structure that specifies the attributes of the tree-view item. 
Return value
Returns the HTREEITEM handle to the new item if successful, or NULL otherwise.
Requirements
| Requirement | Value | 
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] | 
| Minimum supported server | Windows Server 2003 [desktop apps only] | 
| Header | 
 | 
| Unicode and ANSI names | TVM_INSERTITEMW (Unicode) and TVM_INSERTITEMA (ANSI) |