Parent access child's methods

[kabilius]

Hi all,

I am trying to access a child's method from parent.. (it seems like the wrong thing to do, but I am kind of out of ideas)

Here is the scenario.
A parent, ParentOne, has 2 sub-classes - ChildOne and ChildTwo.
Both ParentOne, ChildOne and ChildTwo implements an interface method called - CalculateDistance().

Here is my code:

ParentOne distance;
distance = new ChildTwo();
distance.CalculateDistance();

When I execute the code, it is using the CalculateDistance() from the ParentOne, but I really want the ChildTwo's CalculateDistance() to be called.

and I can't seem to figure out the way to do it.
Any idea?

Thank you in advance for the help,
kab