You can specify the choice items on creation of the list object, or afterward using the list object’s add() method.

Taken from javaScript Tools Guide.

ListItem

Items added to or inserted into any type of list control are ListItem objects, with properties that can be manipulated from a script. ListItem elements can be of the following types: uitem: the typical item in any type of list. It displays text or an image, and can be selected. To display an image, set the item object’s image property;

also taken from javaScript Tools Guide.

I still do not get it.

Ok I feel like I am getting somewhere but I still need help.

using and example for lists shown in scriptui-1-9 I can add to my drop down menu an item. However I want to replace those items depending on other selections. So I need to remove multiple items and replace them with multiple items.

myStandardDown.onChange = function () {if (myStandardDown.selection==1){myTypeDown.add ("item", lithoNames)}}

this will add but it only adds one line I need it to be a menu with multiple lines. I also need to remove all the other Items in the dropdown.

I hope this is clear.

So I think I have figured it out although if you have a better way of righting this feel free to post but this works.

myStandardDown.onChange = function () {if (myStandardDown.selection==1){while (myTypeDown.items.length> 0) {myTypeDown.remove (myTypeDown.items[0]);}

            for (var i = 0; i <lithoNames.length; i++){myTypeDown.add ("item", (lithoNames[i]));}myTypeDown.selection=0}

        else if (myStandardDown.selection==2){while (myTypeDown.items.length> 0) {myTypeDown.remove (myTypeDown.items[0]);}

            for (var i = 0; i <embossNames.length; i++){myTypeDown.add ("item", (embossNames[i]));}myTypeDown.selection=0}

        else{while (myTypeDown.items.length> 0) {myTypeDown.remove (myTypeDown.items[0]);}

            for (var i = 0; i <execNames.length; i++){myTypeDown.add ("item", (execNames[i]));}myTypeDown.selection=0}}

basically on change it deletes the list from the drop down in a while loop then adds a list back in with a for loop depending on the selection that was made on change.