Tizen Developers

Hi,

You can change the background color of button when it's focused by changing "bg_focused" part color of native button of Tizen platform.

To do this, you need to customize Xamarin.Forms.Button.

namespace ColorTest

{
    class MyButton : Xamarin.Forms.Button
    {
    }
}

[assembly:ExportRenderer(typeof(MyButton), typeof(MyButtonRenderer))]
namespace ColorTest
{
    class MyButtonRenderer : ButtonRenderer
    {
        public MyButtonRenderer() : base()
        {
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            if (e.PropertyName == Button.IsFocusedProperty.PropertyName)
            {
                Control.SetPartColor("bg_focused", ElmSharp.Color.Orange);
            }
        }

    }
}

Instead of Xamarin.Forms.Button, you can use MyButton to change the background color of focused button.

FYI, you can get more about "Custom Renderer" from  here. 

Thanks.