How to implement the SelectionMargin feature in WinForms SyntaxEditor (EditControl)?

private void Width_menuItem_Click(object sender, System.EventArgs e)
{
    MenuItem item = sender as MenuItem;
    if (item.Text == "25")
       this.editControl1.SelectionMarginWidth = 25;
    else if (item.Text == "50")
       this.editControl1.SelectionMarginWidth = 50;
    else if (item.Text == "75")
       this.editControl1.SelectionMarginWidth = 75;
    else if (item.Text == "100")
       this.editControl1.SelectionMarginWidth = 100;
    else if (item.Text == "125")
       this.editControl1.SelectionMarginWidth = 125;
}
private void BackgroundColor_menuItem_Click(object sender, System.EventArgs e)
{
    MenuItem item = sender as MenuItem;
    if (item.Text == "LightBlue")
       this.editControl1.SelectionMarginBackgroundColor = Color.LightBlue;
    else if (item.Text == "IndianRed")
       this.editControl1.SelectionMarginBackgroundColor = Color.IndianRed;
    else if (item.Text == "Beige")
       this.editControl1.SelectionMarginBackgroundColor = Color.Beige;
}
private void ForegroundColor_menuItem_Click(object sender, System.EventArgs e)
{
    MenuItem item = sender as MenuItem;
    if (item.Text == "Gray")
       this.editControl1.SelectionMarginForegroundColor = Color.Gray;
    else if (item.Text == "Maroon")
       this.editControl1.SelectionMarginForegroundColor = Color.Maroon;
    else if (item.Text == "Navy")
       this.editControl1.SelectionMarginForegroundColor = Color.Navy;
}

Private Sub Width_menuItem_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim item As MenuItem = TryCast(sender, MenuItem)
    If item.Text = "25" Then
       Me.editControl1.SelectionMarginWidth = 25
    ElseIf item.Text = "50" Then
       Me.editControl1.SelectionMarginWidth = 50
    ElseIf item.Text = "75" Then
       Me.editControl1.SelectionMarginWidth = 75
    ElseIf item.Text = "100" Then
       Me.editControl1.SelectionMarginWidth = 100
    ElseIf item.Text = "125" Then
       Me.editControl1.SelectionMarginWidth = 125
    End If
End Sub 'Width_menuItem_Click
Private Sub BackgroundColor_menuItem_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim item As MenuItem = TryCast(sender, MenuItem)
    If item.Text = "LightBlue" Then
       Me.editControl1.SelectionMarginBackgroundColor = Color.LightBlue
    ElseIf item.Text = "IndianRed" Then
       Me.editControl1.SelectionMarginBackgroundColor = Color.IndianRed
    ElseIf item.Text = "Beige" Then
       Me.editControl1.SelectionMarginBackgroundColor = Color.Beige
    End If
End Sub 'BackgroundColor_menuItem_Click
Private Sub ForegroundColor_menuItem_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim item As MenuItem = TryCast(sender, MenuItem)
    If item.Text = "Gray" Then
       Me.editControl1.SelectionMarginForegroundColor = Color.Gray
    ElseIf item.Text = "Maroon" Then
       Me.editControl1.SelectionMarginForegroundColor = Color.Maroon
    ElseIf item.Text = "Navy" Then
       Me.editControl1.SelectionMarginForegroundColor = Color.Navy
    End If
End Sub 'ForegroundColor_menuItem_Click