TB_BUTTONSTRUCTSIZETB_BUTTONSTRUCTSIZE*
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TB_BUTTONSTRUCTSIZE


TB_BUTTONSTRUCTSIZE
    wParam = (WPARAM) cb; 
    lParam = 0;

Specifies the size of the TBBUTTON structure.

cb
Size, in bytes, of the TBBUTTON structure.

The system uses the size to determine which version of the common control dynamic-link library (DLL) is being used.

If an application uses the CreateWindowEx function to create the toolbar, the application must send this message to the toolbar before sending the TB_ADDBITMAP or TB_ADDBUTTONS message. The CreateToolbarEx function automatically sends TB_BUTTONSTRUCTSIZE, and the size of the TBBUTTON structure is a parameter of the function.

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