$.messager.prompt with miltiline input

[Coder]

Code:

  $.messager.prompt({
    title: ' new Note',
    msg: '',
    fn: function(r){
      if (r){ alert(r);}
  });
    $(".messager-window .messager-input")
    .textbox({width:260,height:100,multiline: true})
    .textbox('textbox').focus();

PROBLEM IS : the 'r' returns filtered value without "\n"

jQ hooks didn't work

Code:

$.valHooks.textarea = {
  get: function( elem ) {
    return elem.value.replace( /\r?\n/g, "\n" );
  }
};

Additional:
how to do to "return false" in fn(r) to prevent to close prompt ?