Uppercase the first letter in a selectedtext() in a jtextfield

Hello,
I want to uppercase the first letter of the selected text in a jtexfield.
I tried :
StringBuffer stb = new StringBuffer(textField.getSelectedText());
stb.setCharAt(0, Character.toUpperCase(stb.charAt(0)));
but it doesn't work
can anyone help me ?
thanx in advance

Well that function shows some bugs then I replace it with this one usins the text area reaplace slected text as camickr said (thanx camickr) and the position of the cursor.
here is the new function :
   * Capitalize the first letter of a selectd string
   * but leave the rest as they are.
public void capitalizeFirstLetter() {
    //get selected text
    selectedText = textArea.getSelectedText();
    try {
      //String buffer to change the case of a letter in a given index
      StringBuffer stb = new StringBuffer(selectedText);
      //Capitalize the first letter of the selected text
      stb.setCharAt(0, Character.toUpperCase(selectedText.charAt(0)));
      //Repalce the selected text with the same but with first letter capitlized
      textArea.replaceSelection(stb.toString());
      tableModel.setValueAt(stb.toString(),
                            sorter.modelIndex(this.getSelectedRow()),
                            findColumnIndex());
      //Renew Selection
      textArea.setSelectionStart(textArea.getCaretPosition() -
                                 selectedText.length());
      textArea.setSelectionEnd(textArea.getCaretPosition());
    catch (Exception ex) {
      JOptionPane.showMessageDialog(null,
                                    "No Selection found, plese select some text before apply this",
                                    JOptionPane.WARNING_MESSAGE);
}

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(c) 2001, Rizal Firmansyah, [email protected]
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"happysailingdude" <[email protected]> wrote
in message
news:e46tjv$e30$[email protected]..
> hi Dan thanks very much. I have made an executive
decision to do a bit of
> a
> hack for now as my site is only small so if a user
enters something in the
> wrong way i can quickly manually update it myself.
>
> so now i have this which works 9 times out of ten if the
user enters a one
> word name eg "bill" or "fred" of "jane" then it works
just fine
>
> the only time it doesnt work is if the user's name is
more than 1 word (or
> is
> hyphenated) eg "mary anne" or "anne-marie" hence the
first cfif line - in
> these
> cases i can manually update
>
> i put this here in case it is of use to anyone else
>
> cheers
>
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(hope that makes sense.)

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Uppercase the first letter in a selectedtext() in a jtextfield

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