Choose the Expand menu item to display in a view
  the children or attributes of objects preceded by
  icons. Children and attributes represent additional
  information or levels of detail about an object.

  To expand a view object preceded by an icon, perform
  the following steps:

  1. Use MB1 to select and highlight the specific object
     in the view

  2. Choose the Expand menu item

  3. Choose either the Children or Attributes submenu
     item

  Optionally, double click on a display line (preceded by
  an icon) in the view. This causes the line to expand or
  collapse, depending on its current state.