upgrade AddItems to share instances they've created so they don't get re-instantiated
upgrade mouse event conversion logic.  hopefully now all bugs are fixed
allow mouse hit on check and radio graphics
don't re-do everything when re-parented
use a real structure when sharing data
Some lists don't need to draw highlight and selection states
tolerate exceptions
handle generic constant binding
handle source changes
somehow host was null but dragImage wasn't
be smarter about when ContentArea is resized
change default duration
fix bug in startup
teach generic binding to handle deferred instances
states need to handle state-dependent events
fix sizing of DDL
SCV shares model with ScrollBar
fix border drawing
reset vars after drop
Need to handle non-IUIBases