Listgrid-dependent selectItem

Is there a simple way of getting a selectitem to derive its values from the current displayed records of a listGrid?

If a selectitem matches field A and the ListGrid displays the following:

then the selectItem should display blue, green, red, orange. (only one "orange" should be displayed).

If something in the listgrid changes and item 2 is removed, for example - then the corresponding item (green) should be removed from the picklist.

Thanks in advance,

Terry