Change colour of Hamburger Icon for Android

I have a MasterDetail page that that has a dark background for the Bar Background. I want the Hamburger icon to be white but I cant find the setting to change the colour. iOS seems to do it automatically but not Android.

I have tried

this.BarTextColor = Color.White;
            this.BarBackgroundColor = Color.FromHex ("00385E");
            this.BackgroundColor = Color.White;

But nothing is working. Where am I going wrong?