This example shows how the onChanging event triggers a event handler that forwards changes in a textbox instantly to another as user keys in characters.

<grid width="100%">
	<rows>
		<row>onChanging textbox: <textbox id="t1" onChanging="copy.value = event.value"/></row>
		<row>Instant copy: <textbox id="copy" readonly="true"/></row>
	</rows>
</grid>