'Declaration
Public Class C1TopAlignTool Inherits C1.WPF.RichTextBox.Ribbon.RichTextBoxToggleButtonTool(Of Nullable(Of C1VerticalAlignment)) Implements IUpdateableTool
public class C1TopAlignTool : C1.WPF.RichTextBox.Ribbon.RichTextBoxToggleButtonTool<Nullable<C1VerticalAlignment>>, IUpdateableTool