Selected value from a Drop-Down list

I am having a hard time figuring out how to get the selcted value from a Drop Down List in the change event.  I am trying to set the number of rows to the number selected in the Drop-Down List.

I have tried:

form1.#subform[0].DropDownList1::change - (JavaScript, client)

Table1.Row1.instanceManager.setInstances(DropDownList1.rawValue);

Can anybody see what I am doing wrong.