Clearing selection in a text field of a dialog window

I'm currently modifying 'Insert text into file names' button by John Zeman. By default, the text(1,) in the text field is selected, is there any way to make it unselected by default?

Rename TO="{DlgStringS|텍스트를 삽입할 위치,입력할 텍스트\n\n(1 = 맨 앞)|1,}"
@nodeselect 

@script vbscript
option explicit

Function Rename_GetNewName ( strFileName, strFullPath, fIsFolder, strOldName, ByRef strNewName )

 Dim strNameOnly
 Dim strExtension
 Dim intComPos ' Location of the leftmost comma in dialog box entry
 Dim strText ' Extracted Text from dialog box entry
 Dim strCount ' Extracted number (of places from left) from dialog box entry

 ' If we're renaming a file then remove the extension from the end and save it for later.
 if fIsFolder or 0 = InStr(strFileName,".") then
 strExtension = ""
 strNameOnly = strFileName
 else
 strExtension = Right(strFileName, Len(strFileName)-(InStrRev(strFileName,".")-1))
 strNameOnly = Left(strFileName, InStrRev(strFileName,".")-1)
 end if

 ' Find the leftmost comma
 intComPos = InStr(strNewName,",")
 if intComPos > 0 then
 strCount = Trim(Left(strNewName, intComPos-1))
 strText = Right(strNewName,Len(strNewName)-intComPos)
 end if

 Dim I
 Dim Dots
 Dots = "" 

 if CInt(strCount) > 0 then
 I = 1
 While I < CInt(strCount)
 Dots = Dots & "."
 I = I+1
 Wend
 Dots = "(^" & Dots & ")"
 else
 ' Character position was not more than 0 - set LeftDots to an invalid value so rename fails
 Dots = "(8SCaO4fOzy5hy4Fs2CxBGCPy6oAl2Hp988ZH9C3toox0HWlmOA)"
 end if
 
 Dim regex
 ' Create a RegExp object
 Set regex = new RegExp
 regex.Pattern = Dots & "(.*)"

 strNameOnly = regex.Replace(strNameOnly, "$1" & strText & "$2")
 strNewName = strNameOnly & strExtension
 
End Function 

From the manual:

{dlgstringS} : The same as {dlgstring} except the contents of the string field are automatically selected (only applies if a default value is specified - see below).

So you want to use {dlgstring} instead.