The add: action adds the specified object as a root node in the tree view.

The add:after: action adds the specified object to the tree view after a previously added item. The new node will have the same parent as the previously added node.

The add:before: action adds the specified object to the tree view before a previously added item. The new node will have the same parent as the previously added node.

The add:parent: action adds the specified object to the tree view as a child of a previously added item. The new node will appear after any existing children of the parent node.

The add:parent:index: action adds the specified object to the tree view as a child of a previously added item, at the specified index.

The addAll: action adds all of the objects in the specified collection to the tree view as root nodes.

The addAll:parent: action adds all of the objects in the specified collection to the tree view as children of the specified parent node.

The childrenForItem: action answers a collection containing all of the children of the specified item in the tree view.

The closeWidget action closes the part, but the connections are maintained and the widget can be reopened.

The collapseItem: action collapses the tree for the specified item in the tree view.

The contentsHelp action requests that the contents of the help file for the part be displayed.

The deleteAllItems action removes all items from the part.

The deleteItem: action removes the specified item from the part.

The deleteItems: action removes all of the items in the specified collection from the part.

The deselectAllItems action deselects all of the items in the part.

The destroyPart action destroys the part and its children, and releases all associated resources. You can use this action for both visual and nonvisual parts. All connections to the destroyed part are removed.

The disable action makes the part unavailable for selection.

The enable action makes the part available for selection.

The expandItem: action expands the tree for an item in the tree view.

The help action requests that the general help associated with the part be displayed. General help is the main help panel associated with the part. You usually access general help through a help button on a window. From the general help panel you can access other help panels (such as menu and field help).

The helpForHelp action requests that help for help be displayed. The help for help panel provides instructions for using a help system. You usually access this help panel from the Help menu. It can contain information such as the structure and organization of the help library.

The helpIndex action requests that the help index be displayed. The help index lists key words or phrases that, when selected, link you to the help panel that explains the word or phrase.

The hide action makes the part invisible.

The isExpandedItems: action answers true if the specified object is currently expanded in the tree view.

The keysHelp action requests that the keys help be displayed. The keys help panel explains the function and use of certain keyboard keys in an application.

The openWidget action opens the part.

The parentForItem: action answers the parent for the specified item in the tree view.

The rootForItem: action answers the root object for the specified item in the tree view.

The setFocus action sets input focus to the part. Focus determines whether or not keyboard input is directed to the part.

The setFocus action acts differently depending on which part is receiving the action. For example, if you connect the setFocus action to a Window part, the window comes to the foreground and is the active window. Or, if you connect the setFocus action to a Text part in a window, the cursor is moved to this field.

The show action makes the part visible.

The showItem: action makes the specified item visible in the tree view. This action causes the tree view to automatically scroll to a position where the specified item is visible.