You are welcome. LWUIT for Series 40 is customized to take into consideration, when possible, the Nokia UI API that is not part of Oracle's standard Java ME (or LWUIT) offering. The interesting thing is that support for the Nokia UI API varies from one Series 40 device to another. In your case, the TextField implementation in LWUIT for Series 40 is actually a custom rendering of a TextEditor, which is a Nokia UI API component. When using the TextEditor one needs to use the MSK to enable editing. Nokia C3-00 supports the TextEditor class and therefore by default when you instantiate a TextField, what you actually get under the hood is a TextEditor. Nokia 6260 slide, does not support the TextEditor class, so the implementation falls back to the default LWUIT TextField.
The good news is that you can force LWUIT for Series 40 not to use native Series 40 components for the rendering of the TextField component with this line:
Then you can use the down key to focus and start typing immediately.
TextField field = new TextField("");