Returns the previous visible TreeItem in the tree or a null object if there is none. If wrap is enabled, the method will wrap around to the last visible element in the tree when called on the first visible element, otherwise it returns null.
See Implementation
Returns the previous visible TreeItem in the tree or a null object if there is none. If wrap is enabled, the method will wrap around to the last visible element in the tree when called on the first visible element, otherwise it returns null.