'宣言 Public Class C1LeftAlignTool Inherits C1.WPF.RichTextBox.C1ToggleButtonTool(Of Nullable(Of C1TextAlignment)) Implements IUpdateableTool
public class C1LeftAlignTool : C1.WPF.RichTextBox.C1ToggleButtonTool<Nullable<C1TextAlignment>>, IUpdateableTool