result not as expected in TextArea.setFocus

there is a Tree and a TextArea, when user double click on the TreeItem, the TreeItem text will be copied to the TextArea, and I want the mouse cursor (focus) remain on the TextArea so when using type some text, the text will be added in the TextArea.
I try to use ScheduledCommand but not work.

dbField.addSelectionHandler(new SelectionHandler<TreeItem>(){
   public void onSelection(SelectionEvent<TreeItem> event){
        customSqlTextBox.setText(event.getSelectedItem().getText());
        Scheduler.get().scheduleDeferred(scheduleCmd);
   }
});

private final ScheduledCommand scheduledCmd = new ScheduledCommand(){
        @Override

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/GCMwr-5ZT5QJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.