[wp-hackers] New WP_List_Table hooks

[Paul]

Happy Thanksgiving to all.

I'm trying to prepare one of my plugins for the upcoming WP 3.1 release. As everyone working on that codebase is aware the various list tables now use the WP_List_Table base class. I have some questions which for some reason are escaping me. 

1. I can add the new column(s). From that I can tell this filter has not changed. I can also add the sortable columns. But this is two different filters. Is there a method to add the column and mark it sortable all in one step?

2. I have the added and sortable column. But when I click on my new column header to sort the entire column blanks out. Looking for some AJAX hook I guess but just not seeing this. Any pointers would be appreciated. 

Thanks,
P-