 
            This function may be called to update (repaint) the GUI thumbnail window if, for example, an image that is being displayed in the window has changed in memory.
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AT_ERRCOUNT ACCUAPI IG_GUI_thumbnail_update (
        HWND hWndThumbnail
);
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| Name | Type | Description | 
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| hWndThumbnail | HWND | Windows handle of a Thumbnail window. | 
Returns the number of ImageGear errors that occurred during this function call.
All pixel formats supported by ImageGear for C and C++.
Display
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HWND      hWndThumb;     /* Handle of Thumbnail window */
IG_GUI_thumbnail_update ( hWndThumb );
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