How do I write a function to display a column as a drop down list? The user should be able to select from this list

[#1]

If this is related to How do I get a list from an SQL query and let the user select the option from the list? you could have most likely kept discussion in that single topic. You have to options for drop-down, Combo box or button box

Names Default To Here(1);

selections = {"One", "Two", "Three"};

nw = New Window("Example",
	H List Box(
		Panel Box("Combo Box",
			cb = Combo Box(selections)
		),
		Panel Box("Button Box",
			btn = Button Box("Select", << Set Menu Items(selections))
		)
	)
);

Combo box is usually easier to use (Scripting Guide - Combo Box )