Using COLOR Field

Hello

I try to use a "Color" field in a template. But, in the pop-up Edition 
windows when I add a new container, field "color" is like a SmallText 
field.

Something missing ?

Exemple (adding field in "main_content.jsp"):
        <content:declareField name='<%="color" + id%>'
            title="Color"
            titleKey="color"
            bundleKey="<%=resBundleID%>"
            type="Color"
        />

Thanks
Nicolas