Custom Item Symbols:Get Symbol
Returns the item symbol as a cluster of image data so you can draw it as a picture using the Draw Flattened Pixmap VI or save the image to a file using the Graphics Formats VIs.
Custom Item Symbols:Get Symbol Array
Returns the item symbols as an array of clusters of image data so you can draw them as pictures using the Draw Flattened Pixmap VI or save the images to files using the Graphics Formats VIs.
Custom Item Symbols:Revert All To Built In Symbols
Resets all item symbols to the default symbols.
Custom Item Symbols:Revert To Built In Symbol
Resets an item symbol to the default symbol for its index.
Custom Item Symbols:Set To Custom Symbol
Sets the image of an item symbol.
Custom Item Symbols:Set To Custom Symbol Array
Sets the images of all item symbols.
Double Click
Returns the unique tag of the last item the user double-clicked or returns an empty string if the user did not double-click an item since you last called this method.
Edit Tree Items:Add Item
Adds an item to the tree control. This method returns a unique tag for the new item.
Edit Tree Items:Add Item to End
Adds an item after all existing items in the tree control.
Edit Tree Items:Add Multiple Items to End
Adds items after all existing items in the tree control.
Edit Tree Items:Delete Item
Deletes an item from the tree control. Wire an empty string to tag and a value of TRUE to Delete Children to delete all items in the tree control.
Edit Tree Items:Move Item
Moves an existing item to a new position in the tree control.
Edit Tree Items:Set Tag
Sets the unique tag of a tree control item, which you use to modify the item or to gather information about the item programmatically.
Edit Tree Items:Sort Children
Sorts the child items under an item alphabetically.
Navigate Tree:Get Child
Returns the tag of the first child item under an item. If the item has no child items, the method returns an empty string.
Navigate Tree:Get Next Item
Returns the tag of the first item after an item at the same level in the hierarchy. If no items exist after the item at the same level in the hierarchy, the method returns an empty string.
Navigate Tree:Get Parent Item
Returns the tag of the parent item above an item. If the item is the topmost item in the tree control, the method returns an empty string.
Navigate Tree:Get Path
Returns an array of unique tags for each item in the path from the root level in the tree control to the item.
Navigate Tree:Get Previous Item
Returns the tag of the item immediately before and at the same hierarchical level as the one you provide as an input. If no items exist before the item at the same level in the hierarchy, this method returns an empty string.
Open/Close:All
Expands or closes all nodes in the tree control.
Open/Close:Ensure Visible
Scrolls to an item and if necessary, expands nodes in the tree control to make the item visible.
Open/Close:Item
Expands or closes a node in the tree control.
Point to Row Column
Converts a pixel coordinate to a tag-column pair in the coordinates of the control. This method also returns whether the point is inside the bounds of the content rectangle and whether the point is within the custom symbol of the cell. The method returns the tag TREE_COLUMN_HEADERS when you wire a point that is within the tree's column headers.

LabVIEW Programming Reference Manual