Dynamic Data - Neighbourhood Highlight
This example shows the power of the DataSet. Once a node is clicked, all
nodes are greyed out except for the first and second order connected
nodes. In this example we show how you can determine the order of
connection per node as well as applying individual styling to the nodes
based on whether or not they are connected to the selected node. The code
doing the highlighting only takes about 1ms, the rest of the time is the
redrawing of the network (9200 edges..).