Tab buttons not aligning right

[Prefader]

I'm wondering if anyone can help me - currently, I'm trying to re-use some elements from Tablets 2. Just about everything is working for me, with one exception - tabs. For the life of me, I can't seem to get the tab frames to align properly. Specifically, the "north" edge of the active tab frame, and I'm seeing a gap between the inactive tabs and the box they appear above. The rectangles I'm pulling the images from appear to be OK - but nothing wants to align properly. I saw a post that said to try making full rectangles for tab buttons, rather than just using the nw, north, and ne pieces, but that only made things look worse for me.

If you were to DL the last Tablets2 on this site and open it in uibuilder, you'll see what I'm talking about.

Any thoughts or help on the subject would be appreciated. Thanks in advance.