Executes the delegate on the main thread that this object executes on.
NB: Assumption is made that Objective-C controls have been created on the Main Thread.


An Object that represents the return value from the delegate being invoked, or null if the delegate has no return value.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)