Tabbing is eratic

I am having strange behavior with tabbing in the grid. The first four columns of my grid are non-editable, the 5th one is editable while the 6th is not. I am able to table all the way to the 5th column, but when i tab to the 6th it tabs out of the grid. I have the following on my grid ui-grid-edit ui-grid-cellNav ui-grid-row-edit ui-grid-selection in my js i have: enableCellEditOnFocus: true,multiSelect: true,

Any help would be greatly appreciated.