What does "rewrite" mean? The Textbox raises the event in the OnClick
method (inherited from Control). You can override this method. Usually
the overriden method is called first:

  Protected Overrides Sub OnClick(ByVal e As System.EventArgs)
     MyBase.OnClick(e)
  End Sub

Armin

Cylix-

I am curious why (and for what) you want to do this, we want to learn here
you know.

-Cor

A questionable motive, but the principle's the same for all the events,
so here goes ...

Derive a custom TextBox class from the standard one, and override (or,
in the case, "extend" (/my/ term)) the processing for "Click" :

Class CustomTextBox
  Inherits TextBox

  Public Sub New()
  End Sub

  Protected Overrides Sub OnClick( _
    e as EventArgs _
  )
    ' Do some custom things here
    ' . . .

    ' Get the Click event raised to anyone /else/ who might be
    '    listening out for it
    MyBase.OnClick( e )

    ' Do some more custom things here
    ' . . .

  End Sub

HTH,
   Phill  W.