Hello,
1. Search this forum to see what you can do. Mostly you will to customize this in style tag.
2. If your pane initially is hidden, the grid will not expand since the width of the hidden element is 0.
3. Again you will to play with the css predefinig the ui-state selected for the grid in your way.
4. So little information. Could not help.
5. Check your server responses – are they correct?
Regards
Tony