code cleanup
more simplers
restore the isMounted method
add a base Container widget
cleanup the Splitter
wip show menu support
add a sample file for the wip menus
wip
wip
will have to use manual active class to support keyboard
wip
data util module no longer needed
get basic open/close/timed behavior working
more tweaks to mouse interaction
improve mouse handling on the menu
update menu sample
wip