Scheduler Drag & Drop not placing items

[Marc Plaxton-Harrison]

Hi All, i am having a slight problem, i am using the drag & drop from a radGrid to a radScheduler, i have many controls on the page, the problem is that when i drag & drop an item on the radScheduler sometimes the item gets placed and other times it doesnt, is it because i have too many controls for the page to postback properly or is there something else wrong?