'Declaration
Public Class C1ItalicTool Inherits C1.WPF.RichTextBox.Ribbon.RichTextBoxToggleButtonTool(Of Nullable(Of FontStyle)) Implements IUpdateableTool
public class C1ItalicTool : C1.WPF.RichTextBox.Ribbon.RichTextBoxToggleButtonTool<Nullable<FontStyle>>, IUpdateableTool