When I click the textfield....

#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

$myForm = GUICreate("", 308, 154, 441, 261)
$R1 = GUICtrlCreateRadio("CHOOSE1", 32, 24, 113, 17)
GUICtrlSetState($R1, $GUI_CHECKED)
$R2 = GUICtrlCreateRadio("CHOOSE2", 32, 80, 113, 17)
$I1 = GUICtrlCreateInput("", 152, 24, 121, 21)
$I2 = GUICtrlCreateInput("", 152, 80, 121, 21)
$b1 = GUICtrlCreateButton("Start", 120, 120, 75, 25)
GUISetState(@SW_SHOW)


While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $b1
If GUICtrlRead($R1) = $GUI_CHECKED Then
MsgBox("", "Tip", GUICtrlRead($I1))
ElseIf GUICtrlRead($R2) = $GUI_CHECKED Then
MsgBox("", "Tip", GUICtrlRead($I2))
EndIf
EndSwitch
WEnd