Improvements to simple grid control

Imported from: http://groups.google.com/group/in-portal-dev/browse_thread/thread/bed312f696ad7580#

I have some minor improvements to our favorite (lately) SimpleGrid control: 

• ability to remove all records with one method call
• protection against deleting records with invalid ids (e.g. record for given id wasn't found)
• ability to add new records after existing ones

simple_grid_ability_to_add_record_after_exisitng_record.patch

simple_grid_ability_remove_all_records.patch

Related Tasks

INP-659 - Getting issue details... STATUS