An event handler function to execute when a property is changed. Functions will be passed an event object including the following properties: propertyDescriptor [type: dundas.PropertyDescriptor] - The property descriptor defining the property that was changed. objectDescriptor [type: dundas.controls.ObjectDescriptor] - The object descriptor to which the property descriptor was added. oldValue [type: Object, mayBeNull: true] - The previous value of the property. newValue [type: Object, mayBeNull: true] - The new value of the property. eventData [type: Object] changedPropertyId [type: String] - The ID of the property descriptor that was changed. beforeState [type: String] - The adapter stringified as JSON before the property change.