ceReady', function( ev ) {
			editor = ev.editor;

			// Show this "on" button.
			document.getElementById( 'readOnlyOn' ).style.display = '';

			// Event fired when the readOnly property changes.
			editor.on( 'readOnly', function() {
				document.getElementById( 'readOnlyOn' ).style.display = this.readOnly ? 'none' : '';
				document.getElementById( 'readOnlyOff' ).style.display = this.readOnly ? '' : 'none';
			});
		});

		function toggleReadOnly( isReadOnly ) {
			// Change the read-only state of the 