Call button click event

I've got a form with the following controls:

txt1, txt2, txt3 and btn1, btn2 and btn3.

When the user double clicked on the text box (txt1 to txt3), I will to click the corresponding buttons (btn1, btn2 or btn3).

I can do the following in the text box double click event:

select case sender.name
case txt1.name: btn1.perform_click
case txt2.name: btn2.perform_click
case txt3.name: btn3.perform_click
end select

This works only if I know how many text boxes are in the form. If I load the text boxes and buttons at run time, may not know how many text boxes I have so I cannot use the Select Case statement to check for which text box is double clicked.

I've try the following:

Dim sv_str_BtnId As String
Dim sv_ctl_Controls() as Button
sv_str_BtnId = "btn" & Replace(sender.name, "txt", "") - this will return btn1 to btnX depending on whch text box is double clickedon.

' Now I try to find the controls.
sv_ctl_Controls = Me.Controls.Find(sv_str_BtnId, False)

If UBound(sv_ctl_Controls) <> -1 Then
sv_ctl_Controls(0).PerformClick()
End If

This does not work at all - the button is not clicked.

Can someone please help?