SSRS - Lost window with datasets

Re: Business Intelligence Development Studio 2008

Often happens to me and not sure why. You open the project and the window panel for the Report Data containing the parameters and datasets isn't there. I spent a bit of time enabling/disabling toolbars before I found this.

1. Open a Report solution (or have one open already?)
2. The menu link is "report data" and it's right at the bottom of the "View" menu.