DataGridView RichTextBox marked on the right-click menu under standard rich text manipulation

DataGridViewRichTextBox右击菜单进行上下标\bin\Debug\DataGridViewRichTextBox.exe
.........................................\...\.....\DataGridViewRichTextBox.pdb
.........................................\...\.....\DataGridViewRichTextBox.vshost.exe
.........................................\...\.....\DataGridViewRichTextBox.vshost.exe.manifest
.........................................\DataGridViewCalendarTextBox.cs
.........................................\DataGridViewRichTextBox.csproj
.........................................\DataGridViewRichTextBox.gpState
.........................................\DataGridViewRichTextBox.sln
.........................................\DataGridViewRichTextBox.suo
.........................................\DataGridViewRichTextBoxColumn.cs
.........................................\Form1.cs
.........................................\Form1.Designer.cs
.........................................\Form1.resx
.........................................\obj\Debug\DataGridViewRichTextBox.csproj.FileListAbsolute.txt
.........................................\...\.....\DataGridViewRichTextBox.csproj.GenerateResource.Cache
.........................................\...\.....\DataGridViewRichTextBox.exe
.........................................\...\.....\DataGridViewRichTextBox.Form1.resources
.........................................\...\.....\DataGridViewRichTextBox.pdb
.........................................\...\.....\DataGridViewRichTextBox.Properties.Resources.resources
.........................................\...\.....\Mandala.BabyTC.RichTextBoxExtended.resources
.........................................\...\.....\TempPE\Properties.Resources.Designer.cs.dll
.........................................\Program.cs
.........................................\...perties\AssemblyInfo.cs
.........................................\..........\Resources.Designer.cs
.........................................\..........\Resources.resx
.........................................\..........\Settings.Designer.cs
.........................................\..........\Settings.settings
.........................................\RichTextBoxExtended.cs
.........................................\RichTextBoxExtended.resx
.........................................\RichTextBoxPrinter.cs
.........................................\obj\Debug\TempPE
.........................................\bin\Debug
.........................................\obj\Debug
.........................................\bin
.........................................\obj
.........................................\Properties
DataGridViewRichTextBox右击菜单进行上下标

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