Gets The type of layout markup to use when rendering this group. If the value is "block"
the renderer must produce an HTML "div" element. Otherwise HTML "span" element must be produced.
the new layout value
Sets The type of layout markup to use when rendering this group. If the value is "block"
the renderer must produce an HTML "div" element. Otherwise HTML "span" element must be produced.
Parameters: layout - the new layout value