Which GWT widget represents a browsable view of a tree in which only a single node per level may be open at one time?

Which GWT widget represents a browsable view of a tree in which only a

1.	Which GWT widget represents a browsable view of a tree in which only a single node per level may be open at one time?
Answer» CellBrowser widget represents a browsable view of a tree in which only a single node per level may be open at one time. This widget will only work in standards mode, which requires that the HTML page in which it is run have an explicit <!DOCTYPE> declaration.