Problem in visualization of Source, using Mercurial

I'm trying FishEye using a Mercurial as repository. In this situation when I try to view a Source file, I can't visualize all the width of my source file. It is very uncomfortable for me. the attachment illustrate my problem. I can't resize the column in witch there are the drop down for the version of a file. I think that the problem is rised because mercurial has a log number for a version number.

The first photo represent my screen, in the second I have highlighted want I should want.

Thanks