Problem in ProtoApp

I am making an application similar to ProtoApp sample.

but I am facing a problem when I am using GraphiView.
GraphView.cs does not show design part of it.
please give a solution for this.

That error message actually tells you how to fix the problem:

If this type is a part of your development project, make sure that the project has been successfully built.
So just compile everything before you open up the Form designer.