GWT中各种Panel

AbsolutePanel	DIV	ComplexPanel	Position widgets absolutely
CellPanel	TABLE	ComplexPanel	[Abstract] Subclass your own cell panels
ComplexPanel	-	Panel	[Abstract] Subclass panels with more than one widget
DeckPanel	DIV	ComplexPanel	Display widgets - one visible at a time
DisclosurePanel	TABLE	Composite	Show/hide a details pane
DockPanel	TABLE	CellPanel	Add widgets N, S, E, W around a central cell
FlowPanel	DIV	ComplexPanel	Add widgets as if to a normal DIV
FocusPanel	DIV	SimplePanel	Add focus to non-focusable widgets
FormPanel	DIV	SimplePanel	Submit a form to a server
Frame	IFRAME	-	Add an IFRAME to the application
HorizontalPanel	TABLE	CellPanel	Add a chain of cells horizontally
HorizontalSplitPanel	DIV	SplitPanel	Move the border between two cells
HTMLPanel	DIV		Add HTML, then access the elements that have IDs
Panel	-	Widget	[Abstract] Base for all panels
ScrollPanel	DIV	SimplePanel	Stack child widgets, displaying contents of only one
StackPanel	TABLE	SimplePanel	Add a vertical chain of widgets
SimplePanel	DIV	Panel	[Abstract] One-widget panel
TabPanel	TABLE	VerticalPanel	Add virtual card-index dividers
VerticalPanel	TABLE	CellPanel	Add a chain of cells vertically
VerticalSplitPanel	DIV	SplitPanel	Move the border between two cells