If you want the particular Redirector module to always open in a new window, then just set it's popup param to True.
<param name="popup">True</param>
On the other hand, if you only want the Redirector to open in a new window sometimes, and it's a SimpleResultsTable or a FlashChart that the user is clicking on, the user can hold down the Ctrl key and the Redirector will pick up on that and open in a new window.
Remember that you can always read about the Redirector module's params, or any module's params, by going to http://<your host and port>/en-US/modules#Splunk.Module.Redirector
You can also read the Sideview Utils documentation itself which talks about how you use Redirector and shows some examples of Redirector in action. Navigate to App > Sideview Utils > Key Techniques > Linking. Read that page and then click 'next page' to see the living examples.
NOTE: there was a Splunk bug around this that I partially patched in the latest version of Sideview Utils. If you set the drilldownPrefix on your SimpleResultsTable or FlashChart to something other than 'click', then holding the CTRL key down would not work to popup the window (the bug effects both Splunk's ViewRedirector module as well as Sideview's Redirector module). I have patched this in Utils for the SimpleResultsTable but not yet for the FlashChart. Maybe this is what you were running into?
