Using Context Menustrips

Public Class Form1

    Private Sub UndoToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles UndoToolStripMenuItem.Click
        RichTextBox1.Undo()
    End Sub

    Private Sub RedoToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles RedoToolStripMenuItem.Click
        RichTextBox1.Redo()
    End Sub

    Private Sub CutToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles CutToolStripMenuItem.Click
        RichTextBox1.Cut()
    End Sub

    Private Sub CopyToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles CopyToolStripMenuItem.Click
        RichTextBox1.Copy()
    End Sub

    Private Sub PasteToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles PasteToolStripMenuItem.Click
        RichTextBox1.Paste()
    End Sub
End Class