The TCM_SETITEM message sets some or all of a tab’s attributes. You can send this message explicitly or by using the TabCtrl_SetItem macro.
TCM_SETITEM wParam = (WPARAM) (int) iItem; // index of the item lParam = (LPARAM) (TC_ITEM FAR *) pitem; // pointer to struct containing item attributes
If the mask member specifies the LVIF_TEXT value, the pszText member is the address of a null-terminated string and the cchTextMax member is ignored.
Returns TRUE if successful or FALSE otherwise.