title: Set a custom FolderBrowserDialog.RootFolder
body: <p>My application wants to offer the client a range of options sets. Each set contains 60 options, variations on a theme. The sets are stored in a folder. Set1 set2 etc. I want to use a the folder browser to select a set but I don't want the user to see the whole drive. I want to set the root folder to the set parent. I have tried using RootFolder but I see that won't work. I also tried using the fileopenDialog but I can't select a folder. Is there a third option?</p>