Hello,
In order to achieve what you want you should add (from the toolbox) two UI controls: a path edit and a push button (positioned in the right side of the path edit control). Then, all you have to do is to edit accordingly the "Text" field (from the "Properties" right pane) of the above push button.
Also, you can take a look on our
"Browse For Folder" how to which could be useful for you.
If there is anything we can help you with just let us know.
All the best,
Daniel