I've added the toolkit.dll as a reference, inherited KryptonForm instead of Form, successfully built the application, everything is working fine, but designer mode fail to display the form. I am getting this error:
Could not find type 'ComponentFactory.Krypton.Toolkit.KryptonForm'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built using settings for your current platform or Any CPU.