Creates a binding that evaluates a callback for particular changes in the collection of navigators of a display.
l_bind_navigator(widget, event, callback)navigator binding id
widget path as a string or as an object handle
a vector with one or more of the following events: 'add',
'delete', 'relabel'
callback function is an R function which is called by the Tcl interpreter if the event of interest happens. Note that in loon the callback functions support different optional arguments depending on the binding type, read the details for more information
Bindings, callbacks, and binding substitutions are described in detail in
loon's documentation webpage, i.e. run l_help("learn_R_bind")
l_bind_navigator_ids, l_bind_navigator_get,
l_bind_navigator_delete, l_bind_navigator_reorder