'宣言 Public Class C1SimplifiedLeftAlignTool Inherits C1.WPF.RichTextBox.C1ToggleItemTool(Of Nullable(Of C1TextAlignment)) Implements IUpdateableTool
public class C1SimplifiedLeftAlignTool : C1.WPF.RichTextBox.C1ToggleItemTool<Nullable<C1TextAlignment>>, IUpdateableTool