bindClassInstance(node, inst) {
			if (!(inst instanceof Class))
				LuCI.prototype.error('TypeError', 'Argument must be a class instance');

			return this.data(node, '_class', inst);
		}
Binds the given class instance ot the specified DOM `Node`.

This function uses the `dom.data()` facility to attach the
passed instance of a Class to a node. This is needed for
complex widget elements or similar where the corresponding
class instance responsible for the element must be retrieved
from DOM nodes obtained by `querySelector()` or similar means.

@instance
@memberof LuCI.dom
@param {Node} node
The DOM `Node` instance to bind the class to.

@param {Class} inst
The Class instance to bind to the node.

@throws {TypeError}
Throws a `TypeError` when the given instance argument isn't
a valid Class instance.

@returns {Class}
Returns the bound class instance.