Hi Mark.

>> I have a listbox with multiselect = .t. I have about 1500 records in it. <<

IMHO, even a listbox with a lot less than 1500 items in it is a user-surly UI. Personally, I think your end-users will hate it.

>> other idea is to put multiselect grid instead of listbox. but then grid does not have interactivesearch. <<

I think this is a much better idea. You do not even have to write your own incremental search grid. If you have a copy of "1001 Things You Wanted to Know ABout VFP" (Akins, Kramek, Schummer - Hentzenwerke, 2000), there is an example of exactly this kind of multi-select grid in chapter 6. You can also download ingrid (an incremental search textbox) from the files section here.

It also becomes very quick and easy to find all the items selected in your multiselect grid using SCAN FOR lSelected.