SelectItem does not show formatted html when MultipleAppearance is set to GRID

[JohnSmith]

In the showcase, it is said that it is possible to format a SelectItem to make it for example show the values in Red and this works in a normal selectItem.
The problem is when the SelectItem MultipleAppearance is set to MultipleAppearance.GRID, the format disappear and the values are shown in Black, why?

This works:

        SelectItem selectItem2 = new SelectItem();   
        selectItem2.setTitle("Select");   
        selectItem2.setMultiple(true);
        selectItem2.setHint("<nobr>A combobox with styled entries</nobr>");   
        selectItem2.setValueMap("<span style='color:#FF0000'>Red</span>",   
                "<span style='color:#00FF00;'>Green</span>",   
                "<span style='color:#0000FF;'>Blue</span>");

This doesn't work:

        SelectItem selectItem2 = new SelectItem();   
        selectItem2.setTitle("Select");   
        selectItem2.setMultiple(true);
        selectItem2.setMultipleAppearance(MultipleAppearance.GRID);
        selectItem2.setHint("<nobr>A combobox with styled entries</nobr>");   
        selectItem2.setValueMap("<span style='color:#FF0000'>Red</span>",   
                "<span style='color:#00FF00;'>Green</span>",   
                "<span style='color:#0000FF;'>Blue</span>");