fixing RangeSelection tool to properly set events as handled
fixing RangeSelection tool to properly set events as handled

ContinuumIO/chaco,burnpanck/chaco,ContinuumIO/chaco,tommy-u/chaco,tommy-u/chaco,burnpanck/chaco,ContinuumIO/chaco,burnpanck/chaco,ContinuumIO/chaco,tommy-u/chaco