 
            This function is called when the user appends a thumbnail in the window hWndThumbnail.
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typedef VOID (ACCUAPI LPFNIG_GUITHUMBCREATE) (
        LPVOID lpPrivate, 
        HWND hWndThumbnail, 
        UINT nIndex
);
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| Name | Type | Description | 
|---|---|---|
| lpPrivate | LPVOID | Far pointer to the private data that was passed. | 
| hWndThumbnail | HWND | Thumbnail window handle. | 
| nIndex | UINT | Index of a thumbnail icon. | 
None
This function does not process image pixels.
None
This type of callback function is registered by a call to IG_GUI_thumbnail_create_CB_register().