Collecting Parameter

Hello,
In a workflow application where in the workflow is customizable, i
would like to defer the instantiation of the class till the workflow is
complete. e.g.

class ClassA {
object1 objA;
object2 objB;
object3 obj3;
ClassA( object1 v1, object2 v2, object3 v3)
{
object1 = v1;
...
object3 = v3;
}

}

Any of the above three member variables could be instantiated first and
hence there are nine combinations. The three member variables are being
instantiated in three diferent forms in a wizard like app.

Since I wanted to keep the model seperate from the view, how could I
defer the instantiation of the ClassA but still keep the controller
generic enough so that the order in which the member varibles are
collected is not sequenced. I read that "Collecting Parameter" pattern
supports something similar to this, however I am not too sure since I
couldn't find the right examples. BTW: I am writing this in C# and so
any other alternatives are welcome as well.

Thanks
sd