A panel that stacks its children vertically, displaying only one at a time, with a header for each child which the user can click to display.
This widget will only work in standards mode, which requires that the HTML page in which it is run have an explicit <!DOCTYPE> declaration.
NOTE: This class is still very new, and its interface may change without warning. Use at your own risk.
Example
{@example com.google.gwt.examples.StackLayoutPanelExample} TODO(jgw): - implement insert(). - add() methods with default widgets for headers. - some way to get the header widget associated with a child. - make animation configurable (with {@link HasAnimation}). - default style.