Adam:

// get the cute editor instance
var editor1 = document.getElementById('Editor1');

editor1.NotifySelectionChange();

'Editor1' should be 'CE_Editor1_ID' when working with CuteEditor for PHP. Unfortunately also with this function still the hidden field isn't updated directly.

I found a workaround myself:

editor1 = document.getElementById('CE_Editor1_ID');
editor1.setHTML( editor1.getHTML() );

However, it would be much better if no custom action would be necessary at all.

Regards,
Jeroen