How to draw indicators in the indicator margin of the WinForms SyntaxEditor (EditControl)?

private void editControl1_DrawLineMark(object sender, Syncfusion.Windows.Forms.Edit.DrawLineMarkEventArgs e)
{
    if( e.VirtualLine % 2 == 0 )
    {
        Brush brush = new SolidBrush(Color.LightSalmon);
        e.Graphics.FillRectangle(brush, e.MarkRect);
        e.Graphics.DrawRectangle(Pens.IndianRed, e.MarkRect);
    }
}

Private Sub editControl1_DrawLineMark(sender As Object, e As Syncfusion.Windows.Forms.Edit.DrawLineMarkEventArgs) Handles editControl1.DrawLineMark
     If e.VirtualLine Mod 2 = 0 Then
         Dim brush = New SolidBrush(Color.LightSalmon)
         e.Graphics.FillRectangle(brush, e.MarkRect)
         e.Graphics.DrawRectangle(Pens.IndianRed, e.MarkRect)
     End If
End Sub 'editControl1_DrawLineMark