Calendar control - adding custom JavaScript to SelectionChanged event

We're using WebTrends to track user behavior on our heavily AJAXian site.

This is achieved by us supplementing the onclick or onchange JavaScript event handlers for all of our controls of interest (LinkButtons, Buttons, DropDownLists etc) with a JavaScript function call that included the ID of the control and a few other pieces of information.

This is working well throughout the site, apart from on the one place that we're using an ASP.NET calendar control.

If the user clicks on a date, or a week selection link we would like to make our little WebTrends JavaScript call. Thing is, the calendar control does not appear to allow us to do this.

The best that we've manages is to add an onclick event handler to each TableCell of the calendar in the DayRender event. This is not ideal though as the user might click on a TableCell, without actually clicking the link w ...