### GoJS Layer Bands

Unlike swim lane diagrams where the nodes are supposed to stay in their lanes, layer bands run perpendicular to the growth direction of the layout.

This sample uses a custom TreeLayout that overrides the TreeLayout.commitLayers method in order to specify the position and size of each "band" that surrounds a layer of the tree. The "bands" are held in a single Part that is bound to a particular node data object whose key is "_BANDS". The headers, and potentially any other information that you might want to display in the headers, are stored in this "_BANDS" object in an Array.

This sample can be adapted to use a GraphLinksModel instead of a TreeModel and a LayeredDigraphLayout instead of a TreeLayout.