Add a graph to the graphswitch widget using a graph object

Graph objects are defined in the graph R package.

# S3 method for graph
l_graphswitch_add(widget, graph, label = "", index = "end", ...)

Arguments

widget	graphswitch widget handle (or widget path)
graph	a graph object created with the functions in the `graph` R package.
label	string with label for graph
index	position of graph in the graph list
...	additional arguments are not used for this methiod

id for graph in the graphswitch widget