I have a project which is purely made of .net client profile.
I needed to use a control nut this control uses the reference system.design, which does not available on client profile,
I cannot change my project framework, and I need this library, so I tried to pull it and grab it as a reference dll to my project, but is did not work ..
What should I do in order to use system.design in client profile environment?
Simply put: you can't.
You'll have to either change the target framework or re-implement the control for the client profile.
Please see the sixth comment on this Scott Hanselman article for more information.