I would check with their documentation you may need to include their css files. If they have css files you could put them into the skin folder and add them into the style.css file as imports like this:

@import url('thevendorprovidedcssfile.css');

Hope it helps,

Joe

The UpdatePanel idea I mentioned before looking at your page. The only reason I suggested it is if other modules are on the same page using the UpdatePanel prevents strange behavior from other modules that may occur during postback. You probably don't need it if the sheduler is the only thing on the page.

Its not sufficient to just drop the css files in the skin folder, there is nothing to automatically include them in the page. Open up the styles.css file and add @import statements to include the css files for the scheduler.

Hope it helps,

Joe