Subclasses can set this to change default css class for a group.

CSV list of additional include files (either .js or .css) that should be included when this component is used on a page.
By default, the file extension (.js or .css) is used to determine whether an item in the list is a script include or a style include. You can override this behavior by adding the terms "script:" or "style:" to the beginning of the file name or names. This prefix is not used as part of the include filename.

Static HTML display method: draw the BODY of this component as HTML.
Subclasses implement this in order to render the static HTML contents of a component.

Send one of several predefined signals to each of the active DragGroup windows associated with this group. Valid signals to pass include:

"resize" - call the onresize handler (if any) for each window
"disableResize" - remove the resize pip from the lower right corners of the windows
"disableMaxToggle" - reset mouse clicks on the header to the default (drag) behavior
"enableMaxToggle" - redefine the window header to be a maximize button rather than a drag handle
"enableResize" - restore the resize pip to the lower right corners of the windows
"removeDragHeader" - completely hide the drag handle and resize the window to use the recovered space
"restoreDragHeader" - restore the drag handle and resize the window to account for the newly used space
"setHeaderStyle" - given a JSON representation of a style object in value, add the given rules to the existing style of the drag header
"setHeaderLayout" - set the headerLayout property of all children to the given value

This client event, if present, is fired when the page is loaded.

Set the value of a named property.