I am making an API Add in that creates sketch segments (lines and splines), is there any built in functionality already in SolidWorks for generating a live sketch preview or do I need dive into OpenGL to handle it?

I need to create a preview similar to any of the sketch segment commands ghost preview when they are being created.

Same up-to-date examples in .NET (C#) would be nice, but if those are not available just being pointed into the right direction would be appreciated. I just can't seem to locate any interfaces or namespaces that would handle the preview unless I am missing something.