Content Elements uses the following events:

display  – called after a new element has been created
remove  – called right before an element is removed
beforeSort – called before sorting has begun
afterSort – called after sorting has stopped

You can bind the callbacks as follows:

ContentElements.bind('my_element', 'display', function(data)
{
	data.find('textarea').focus();
});

Explanation:

‘my_element’ is the name of your element
‘display’ – event
function(data) – callback