How to change the color of MenuItem in ViewCell

Can anyone please tell me that how could I change the color of MenuItem. Just like iPhone's Mail App has three different colors of MenuItems.

public class MyListCell : ViewCell
 {
        public PromiseListCell()
            {
                var greenOption = new MenuItem() {Text = "Green"};   // I want to change its color to Green.
                ContextActions.Add(greenOption );
        }
 }

Any help will be appreciated.