Resize issue

Hi, I have AutoCAD drawings embedded in my Mathcad worksheets. Whenever, I edit and update the drawing (by double clicking on the embedded drawing) Mathcad expands it greatly, almost to the entire page.

Is there way to lock size of the Embedded AutoCAD object?

Also, I am wondering is the issue with Mathcad or I have to set some option in AutoCAD itself.

Any thoughts?
-John