How do you change the mouse over highlighting?

In GWT, I am using CellTable.

When you mouse over the CellTable it highlights each row.

How do change the behavior of the highlighting from the mouse over? Specifically:

• change the color of highlighting
• disable/enable
• make it highlight only the specific grid item at your cursor (instead of the entire row)

( The current hack I have is to create a bunch of 1 column wide CellTables and add them to a VerticalPanel layout... creating the illusion that there is one CellTable and it highlights each grid according to your cursor. Is this bad? Why? performance? )