Monotouch.Dailog change font color for selected item of RadioElement

Question

I have used Monotouch.Dailog to create list items for radio selection, I need to change the font color of selected radio element to blue and make it bold how can I do that?

public class Demo : DialogViewController{

    public override void ViewWillAppear(bool animated) {
        this.Root = new RootElement ("Fruits", new RadioGroup ("Apple")) {
            new Section (" ") {
                new RadioElement ("Apple"),
                new RadioElement ("Mango"),
                new RadioElement ("Banana"),
            }
        };
    }
}

I am not able to find any attributes or overridden methods to change the font color or attributes of the element.