Changing a Tooltip Text

I'm using VB.Net 2010 (Professional)

I have a row of buttons that allow the user to add notes at various places in my app.  The user clicks the button, a dialog box opens allowing the user to type in the note after which he'll click the OK button, etc.  
Rather than have the user click the button to view an existing note, I was putting the text of the note in the button's tooltip.  However I discovered if the user changes the note text, but the original tooltip and the revised tooltip appear during a subsequent hover.

So my question is, how do I change a tooltip's text, rather than create a new tooltip every time the user edits the note text?

My code (sort of):
Private Sub btnNote1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNote1.Click
    Dim ttMain As New ToolTip()
    ttMain.AutoPopDelay = 5000
    ttMain.InitialDelay = 1000
    ttMain.ReshowDelay = 500
    ttMain.ShowAlways = True

    dlgNote.Note = m_Notes(1)
    Select Case dlgNote.ShowDialog()
        Case Windows.Forms.DialogResult.OK
            mm_Notes(1) = dlgNote.Note
            ttMain.SetToolTip(sender, dlgNote.Note)
        Case Windows.Forms.DialogResult.Cancel
            m_Notes(1) = m_ObsNotes.Plumb(nIndex)
        Case Windows.Forms.DialogResult.Ignore
            m_Notes(1) = ""
            ttMain.SetToolTip(sender, "")
    End Select
End Sub

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LVL 10
ClifAsked:
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nepaluzCommented:
when saving the note from your dialog, replace the old note with the new note rather than appending the new note to the old one.
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Jacques Bourgeois (James Burger)PresidentCommented:
Remove the old tooltip before changing it to a new one:

ttMain.SetToolTip(sender, "")
ttMain.SetToolTip(sender, dlgNote.Note)
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Don't use a new ToolTip for every single button though!  Just declare it at Class(Form) level and re-use the same instance for all the controls.
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ClifAuthor Commented:
That did it.  Thanks.
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