Adding ReSharper options to context menu in Visual Studio

In Visual Studio 2005, my coworker can right click a tab and he has an option "Find in Solution Explorer". I know this is from ReSharper and I'm running ReSharper 5.1 - how do I enable this extra context menu? I also know about th开发者_如何学Ce Shift+Alt+L shortcut for the same command but want to add the context menu.

This is what I see when I right click on a tab. The picture below is when I right clicked on a .cs file.

EDIT: Typo in the title.

Tools > Customize... > Toolbars tab > tick Context Menus. Find Other Context Menus > Easy MDI Document Window. Commands tab > ReSharper > ReSharper_LocateInSolutionExplorerAction. Drag it into the menu. Click Close.