function preventMouseDown(evt) {
            // Prevents the foucus event from firing if the click event is already going to fire.
            // If both events fire it will cause bouncing behavior.
            evt.preventDefault();
          }
@ngdoc directive
 @name ui.grid.cellNav.directive:uiGridCell
 @element div
 @restrict A
 @description Stacks on top of ui.grid.uiGridCell to provide cell navigation