Expands an ExpandBar.
This functionality is supported only if you are using the Open Agent.
|Item||The item to expand. LISTITEM.|
Expand expands the specified item if it is currently collapsed (that is, has visible children).
If the item has an expand/collapse box (typically a + or - sign), Silk Test Classic expands the item by clicking on this box.
Otherwise, if the treeview supports the use of double-click to expand and collapse items, Silk Test Classic double-clicks on the item.
If neither approach is supported by the control, or if the specified item is not expandable (that is, has no children), an error is raised.