[TxMt] Web preview disappears?

[Brett Terpstra]

I know it's probably something obvious I'm not doing, but I'd really  
like to be able to preview an HTML document in a project while  
editing a linked CSS file.  Every time I open a preview on the HTML  
document and switch to the CSS file in my project, the web preview  
closes.  Is this normal?

I've been doing fine with using the "Refresh open browsers" command  
and split off commands to shift-refresh firefox and exclusively  
refresh Xylescope, but having the instant feedback in the web preview  
would be great, especially when combined with the current ability to  
pipe through your PHP installation.

Thanks,
Brett