How to set different background colors for the lines in the WinForms SyntaxEditor (EditControl)?

private IBackgroundFormat RegisterFormat()
{
    Color background = Color.Empty, foreground = Color.Empty;
    if(radioButton1.Checked )
       background = radioButton1.BackColor;
    else if(radioButton2.Checked )
       background = radioButton2.BackColor;
    else if(radioButton3.Checked )
       background = radioButton3.BackColor;
    if(radioButton6.Checked )
       foreground = radioButton6.BackColor;
    else if( radioButton5.Checked )
       foreground = radioButton5.BackColor;
    else if( radioButton4.Checked )
       foreground = radioButton4.BackColor;
    bool bUseHatchFille = comboBox1.SelectedIndex > 0;
    HatchStyle style = ( bUseHatchFille )? ( HatchStyle )Enum.Parse( typeof( HatchStyle ),
comboBox1.SelectedItem.ToString() ): HatchStyle.Min;
    IBackgroundFormat format = editControl1.RegisterBackColorFormat( background, foreground, style, bUseHatchFille );
    return format;
}
//code for setting line backcolor for the entire line
private void button1_Click(object sender, System.EventArgs e)
{
    IDynamicFormat[] temp = editControl1.GetLineBackColorFormats( editControl1.CurrentLine );
    IBackgroundFormat format = RegisterFormat();
    editControl1.SetLineBackColor( editControl1.CurrentLine, true, format );
}
private void Form1_Load(object sender, System.EventArgs e)
{
    //comboBox1.Items.Clear();
    comboBox1.Items.Add( "Solid" );
    foreach( string name in Enum.GetNames( typeof( HatchStyle) ) )
    {
        comboBox1.Items.Add(name);
        comboBox1.SelectedText = "Percent05";
        comboBox1.SelectedIndex = 0;
        editControl1.Text += "\n";
        editControl1.CurrentLine = 1;
    }
}
//code to set the backcolor for a selected text
private void button2_Click(object sender, System.EventArgs e)
{
    IBackgroundFormat format = RegisterFormat();
    editControl1.SetSelectionBackColor(format);
}

Private Function RegisterFormat() As IBackgroundFormat
    Dim background As Color = Color.Empty, foreground As Color = Color.Empty
    If radioButton1.Checked Then
       background = radioButton1.BackColor
    ElseIf radioButton2.Checked Then
       background = radioButton2.BackColor
    ElseIf radioButton3.Checked Then
       background = radioButton3.BackColor
    End If
    If radioButton6.Checked Then
       foreground = radioButton6.BackColor
    ElseIf radioButton5.Checked Then
       foreground = radioButton5.BackColor
    ElseIf radioButton4.Checked Then
       foreground = radioButton4.BackColor
    End If
    Dim bUseHatchFille As Boolean = comboBox1.SelectedIndex > 0
    Dim style As HatchStyle = If((bUseHatchFille), CType(System.Enum.Parse(GetType(HatchStyle), comboBox1.SelectedItem.ToString()), HatchStyle), HatchStyle.Min)
    Dim format As IBackgroundFormat = editControl1.RegisterBackColorFormat(background, foreground, style, bUseHatchFille)
    Return format
End Function
'code for setting line backcolor for the entire line
Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
     Dim temp() As IDynamicFormat = editControl1.GetLineBackColorFormats(editControl1.CurrentLine)
     Dim format As IBackgroundFormat = RegisterFormat()
     editControl1.SetLineBackColor(editControl1.CurrentLine, True, format)
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
     comboBox1.Items.Clear()
     comboBox1.Items.Add("Solid")
     For Each name As String In System.Enum.GetNames(GetType(HatchStyle))
          comboBox1.Items.Add(name)
          comboBox1.SelectedText = "Percent05"
          comboBox1.SelectedIndex = 0
          editControl1.Text += Constants.vbLf
          editControl1.CurrentLine = 1
     Next name
End Sub
'code to set the backcolor for a selected text
Private Sub button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
     Dim format As IBackgroundFormat = RegisterFormat()
     editControl1.SetSelectionBackColor(format)
End Sub