update to canvas render.
update example to work on initial render
sorting on single row.  hierarchical sort is in progress
bigger border around display
widen test harness.  support input of rows to group on.
support global color map. better support for row selector.
parameterize row/column sizes
enable detection of cursor position in regards to data point or data group
clean up example
clean up behavior
cleaner overflow
store ui state on widget events
switch over name and example