Anchoring / tabControl Problem

Hi all,

I've been getting a strange problem with anchoring on my forms. I have
a form where I put on a tabControl. I set it's anchoring to Top,
Bottom, Left, Right. I put a number of tabPages on to the control. On
the first tab I put textBoxes and comboBoxes. I set all their widths to
655 and their anchoring to Top, Left, Right.
When I run the app, the form appears and all the textboxes and
comboBoxes have truncated from the right, the left hand side is fine.
When I go back to designer it's truncated as well. The more I run it
the more truncated it gets.
I'm not sure is the problem with the anchoring or the tabControl. I've
used tabControls and anchroing textboxes in other controls and things
have been fine
Has anyone else had this issue?

Thanks in advance for any help,
Dave