TCallbackOptions allows a common set of callback client-side options to be attached to one or more active controls. This can be useful if a lot of active controls on the same page are sharing the same callback client-side options. Instead of specifying the same set of options again and again inside each control, these can be written once inside a TCallbackOptions; this TCallbackOptions can be then attached to each control using the ActiveControl.CallbackOptions property. For a full list of assignable properties, please check the TCallbackClientSide documentation.
The typical scenario of use for a TCallbackOptions is a page where a lot of active controls needs to pause the user interaction with a "Please wait" style message until callback completion. First create a single TCallbackOptions control, assign it an ID and the the needed properties:
Then, share this set of options to one or more active controls; each control will follow them: