Getting rid of borders in GridView, WPF/WinForms issues

[ris-work]

Expected Behavior

The borders are gone.

Actual Behavior

The borders are still there. I don't know what those black and white boxes are.
I even tried setting WPF GridView's border brush to transparent. Didn't work.
What are those? On WinForms, I am unable to style the selected row, but the borders aren't there.

Steps to Reproduce the Problem

Create a GridView.
Load it up with random entries.

Code that Demonstrates the Problem

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Eto.Forms;
using Eto;
using System.IO;

namespace HealthMonitorLogViewer
{
    public class NavigableListFormMinimal: Form
    {
        public NavigableListFormMinimal()
        {
            GridView LB = new GridView() { ShowHeader = false, GridLines = GridLines.None };
            LB.Size = new Eto.Drawing.Size(200, 600);
            LB.Columns.Add(new GridColumn() { HeaderText = "Navigate to...", DataCell = new TextBoxCell(0){ } });
            LB.BackgroundColor = Eto.Drawing.Colors.Black;
            //LB.TextColor = Eto.Drawing.Colors.White;
            //LB.Font = new Eto.Drawing.Font("Courier", 18);
            
            Panel CurrentPanel = new Panel();
            
            var loadOncePanels = new List<string>() {
                "Network Stats Panel",
                "Network Stats Panel 2",
                "Network Stats Panel 3",
                "Network Stats Panel 4"
            };
            LB.DataStore = loadOncePanels.Select(x => new List<string>() { x  }).ToList();
            Content = new StackLayout(new StackLayoutItem(LB), new StackLayoutItem(CurrentPanel)) { Orientation = Orientation.Horizontal, Spacing = 10 };
            LB.GridLines = GridLines.None;

            LB.CellFormatting += (e, a) => {
                if (a.Row == LB.SelectedRow)
                {
                    a.ForegroundColor = Eto.Drawing.Colors.Black;
                    a.BackgroundColor = Eto.Drawing.Colors.White;
                    
                }
                else
                {
                    a.ForegroundColor = Eto.Drawing.Colors.Wheat;
                    a.BackgroundColor = Eto.Drawing.Colors.Black;
                }
                a.Font = new Eto.Drawing.Font("Segoe UI", 10, Eto.Drawing.FontStyle.Bold, Eto.Drawing.FontDecoration.None);
            };
            BackgroundColor = Eto.Drawing.Colors.Black;
            Padding = 10;
        }
    }
}

Specifications

• Version:
• Platform(s): WPF, WinForms
• Operating System(s): Windows 10