TCM_SETITEMEXTRA


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TCM_SETITEMEXTRA
TCM_SETITEMEXTRA 
    wParam = (WPARAM) (int) cb;
    lParam = 0;
Sets the number of bytes per tab reserved for application-defined data in a tab control. You can send this message explicitly or by using the TabCtrl_SetItemExtra macro.
Returns TRUE if successful, or FALSE otherwise.

cb
Number of extra bytes.

By default, the number of extra bytes is four. An application that changes the number of extra bytes cannot use the TCITEM structure to retrieve and set the application-defined data for a tab. Instead, you must define a new structure that consists of the TCITEMHEADER structure followed by application-defined members.
An application should only change the number of extra bytes when a tab control does not contain any tabs.

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