Create an Array of strings array<String>
Use the 'Click' activity on the dropdown menu
Get the 'selecter' by going to the UiExplorer and make sure to enable the aaname property, which is by default set to whatever is currently selected.
Loop over your Array<String> from point 1 and change the 'Click' activity's selector's "aaname='---'" to "aaname='" + currentString + "'",making it dynamic.