Returns an NSInvocationOperation object initialized with the specified target and selector.
Original signature is '- (id)initWithTarget:(id)target selector:(SEL)sel object:(id)arg'
Available in Mac OS X v10.5 and later.

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- target (Id)
- The object defining the specified selector.
- sel (IntPtr)
- The selector to invoke when running the operation. The selector may take 0 or 1 parameters; if it accepts a parameter, the type of that parameter must be id. The return type of the method may be void, a scalar value, or an object that can be returned as an id type.
- arg (Id)
- The parameter object to pass to the selector. If the selector does not take an argument, specify nil.

An initialized NSInvocationOperation object or nil if the target object does not implement the specified selector.

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