I have a radcombobox CheckBoxes="True" and AutoPostBack="True" because I need server side code to execute after the user makes her selections. However, the postback is occurring every time a user checks a box and then it closes the combobox. The user wants the combobox to stay open and I don't want the postback to occur until the user is finished and clicks off of the combobox. I am experimenting with using the combobox's OnClientBlur event and then doing a postback like this: __doPostBack(objName, "ItemChecked"); But I'm struggling to get it to work and not confident that's the right path.