Multiple user edits on a grid

[Kathy]

I have two database tables, a site table and a vendor table.  The site table is just a name, id, and created date.  The vendor table has a bunch of contact info fields, a vendor id, and a site id.  So these two tables are related.  I make 2 datasources, one for the site table and one for the vendor table.  I hook up the grid to the vendor datasource.  I make the site id field a dropdown and hook up the site datasource to that.  What I would like to do is this: if there are no sites in the system, I would like the dropdown to have an entry something like "create a site" or even a hyperlink next to the combo that says "create a site" and it would bring up a user edit form or even just an input box of some sort to create the site.  How would I go about doing something like this?  Thanks.