Vertical dark Line below cursor

My application is developed in .Net 2003. My application has 2 treeview. When I install and run my application in fresh machine which has .net framework 2.0 and no .net framework 1.1. I found tat the cursor is different in one of the treeviews. A small vertical dark line appears below the cursor. Other than this application works fine. Is there anyway to fix this, please let me know.

Thanks in advance

Pradeep

[431 byte] By [SPradeep] at [2007-12-24]