If I am in a file the preview tab and I open the corresponding file (i.e. a header) the new file is always open permanent and not in the preview.
Executing the command from the preview tab should open the new file in the preview tab too.
Martin Richter [rMVP] WWJD http://blog.m-ri.de "A well-written program is its own heaven; a poorly written program is its own hell!" The Tao of Programming