Ok I cannot freaking can't believe this. I cannot find a dropdown menu in Sketchflow - Expression Blend 4. I need to create a mockup quicky and easy and it's amazing how I cannot find a simple dropdown to drag to my project's web page mock-up I am creating here.
In WPF/SL the dropdown is called
ComboBox
You can search for the
sketch
controls and select the ComboBox from the Assets window, or you can select it from right clicking on the Buttons icon on the toolbar: