ShComboBox.Net Control 7.0 is a Windows-Explorer-like drive-selection combobox which shows all the drives, folders and optionally files in a cascaded manner. It mimics all aspects of the Windows-Explorer combobox from displaytexts, icons, overlayicons, virtual folders and AutoComplete and much more. Additionally 2-line integration with FolderView and FileView controls instantly brings complete Windows Explorer functionality to your app.

For more information  :
http://www.ssware.com/shcmbbox/shcmbbox.htm