The width of the listbox or dropdown used by survey item.
The value can be specified in percentages, pixels, or points.
The following displays the value of listwidth in a text stimulus:
<text sometext>
/ items= ("listwidth = <% listbox.q1.listwidth %>")
</text>
The following displays the value of listwidth in an instruction page:
<page somepage>
listwidth = <% dropdown.q1.listwidth %>
</page>