TB_INSERTBUTTON    
The
TB_INSERTBUTTON message inserts a button in a toolbar.
TB_INSERTBUTTON 
wParam = (WPARAM) iButton; 
lParam = (LPARAM) (LPTBBUTTON) lpButton; 
 
Parameters
iButton
Zero-based
index of a button. The message inserts the new button to the left of this button.
lpButton
Pointer to a TBBUTTON
structure containing information about the button to insert. 
Return Values
Returns TRUE
if successful or FALSE otherwise.
See Also