TimeTextBox in grid

[dreamdog]

Does TimeTextBox work in grid?  Been searching for information on how to make it work, but no go.  I have it working outside of the grid and have DateTextBox working within the grid.
I have this in my layout:
{
       name: "Start Time 1",
       field: "starttime1",
//     type: dojox.grid.cells.TimeTextBox,
       dojoType: dijit.form.TimeTextBox,
       constraints:{timePattern:'HH:mm:ss', clickableIncrement:'T00:15:00', visibleIncrement:'T00:15:00', visibleRange:'T01:00:00'},
       editable: true
}

Thanks