Generates a bidirectional binding (or "bind with inverse") between two instances of javafx.collections.ObservableMap.

A bidirectional binding is a binding that works in both directions. If two properties a and b are linked with a bidirectional binding and the value of a changes, b is set to the same value automatically. And vice versa, if b changes, a is set to the same value.

Only the content of the two maps is synchronized, which means that both maps are different, but they contain the same elements.

A bidirectional content-binding can be removed with unbindContentBidirectional(Object, Object).

Note: this implementation of a bidirectional binding behaves differently from all other bindings here in two important aspects. A property that is linked to another property with a bidirectional binding can still be set (usually bindings would throw an exception). Secondly bidirectional bindings are calculated eagerly, i.e. a bound property is updated immediately.

Parameters:

<K>		the type of the key elements
<V>		the type of the value elements
map1		the first ObservableMap<K, V>
map2		the second ObservableMap<K, V>

Since:  JavaFX 2.1