Shortcut Key for OK Button on Dialog Box with Grid

In a desktop app, I have dialog boxes that contain one or more small grids, various other simple controls, as well as the usual OK/Cancel buttons. Grids pose a problem to the usual use of Enter as a shortcut to the OK button, as Enter is expected by users to navigate within the grid. Is there another standard alternative? I'm leaning to Ctrl+Enter. While this has use in grids, it is generally only while in in-cell mode, and would not pose a conflict when not in that mode.