Issue about FileBrowserSheet

[HeroLi]

Dear all

when i use FileBrowerSheet(pivot-wtk-2.0.jar) to download file ,a error 
message is always showed in console.

error message:"keyboardFolderTraversalEnabled" is not a valid style for 
org.apache.pivot.wtk.FileBrowser

the code where i used the filebrowersheet class is below:

        somePushButton.getButtonPressListeners().add(new 
ButtonPressListener() {
 
                        @Override
                        public void 
buttonPressed(org.apache.pivot.wtk.Button arg0) {
                                try {
                        final FileBrowserSheet fileBrowserSheet = new 
FileBrowserSheet(FileBrowserSheet.Mode.SAVE_AS);
                        fileBrowserSheet.open(window, new 
SheetCloseListener() {
                            @Override
                            public void sheetClosed(Sheet sheet) {
                                if (sheet.getResult()) {
                                        // file name
                                    Sequence<File> selectedFiles = 
fileBrowserSheet.getSelectedFiles();
                                    // file output
                                        ... 
                                }
                            }
                        }); 
                                } catch (Exception ex) {
                                        System.err.println(ex);
                                }

                        }
                });

the error message occured where is marked in red.

I am looking forward to your help.

If anything not clear.let me know please.

Thanks and regards.

Hero