Square corners on thick rectangle

Hi I have flash 8 and I want to make a movieclip of a square with a thickness of 10px, no fill color, and square corners. I can draw the square ok, I choose square from the “cap” option in the properties inspector. When I convert the square to a movieclip it defaults to round corners. Can anyone help me with a way around this?

Thanks,

Matt.

Set join to mitre and mitre limit to anything greater than the square root of 2 (1.414).

Thanks works great.