allow tab key in select case for ascii vba

i'm having an issue that when a person presses a  <tab> key going from textbox to textbox,

The code below is firing off in the next textbox in the tab order. even though I have not pressed keys in that next textbox yet  ?

The event i have it on is..
Private Sub QUOTE_GP_KeyPress(KeyAscii As Integer)

Select Case True 'always your best friend
    Case (KeyAscii > 47 And KeyAscii < 58)
    Case (KeyAscii = 8)
    Case (KeyAscii = 43)
    Case (KeyAscii = 45)
    Case (KeyAscii = 46)
    Case Else
      '  MsgBox ("quote gp You Must Enter Numbers Only!")
        KeyAscii = 0
        Exit Sub
End Select

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