Automator/Action(s) C# clone

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C#

Visual-Studio

Hi Everyone,
I am trying to make a program in Visual Studio using C# that would look and function like OSX's Automator, or the Java program Action(s) (http://app.jbbres.com/actions/). I am running into a bit of trouble, however, when trying to design the piece of the program where when I drop the selected action onto the box on the right half of the screen, it shows additional parameters to enter to tailor the action to the users' specific needs. I am thinking about using custom controls for my additional parameters, but I am unsure of which type of control would allow me to add custom controls within itself in such a way that they can be rearranged, and you can scroll through them if the controls extend beyond the edges of the window. Does anyone have any suggestions on what I should do?

Thanks,
Bobby