ASPxGridView -Custom Controls In DetailRow?

try to have custom controls in a DevExpress grids detail row. When ever a row is expanded I would like to load data into those custom controls based on the Masters Key.I am using the detailrow expended method.

protected void grid_DetailRowExpandedChanged(object sender, ASPxGridViewDetailRowEventArgs e)
if (e.Expanded)
{
int id = Convert.ToInt32(grd.GetRowValues(e.VisibleIndex, "ID"));
...
}

The problem is I don't know how to access the custom controls in the expended detail row. I don't see any Row or Items properties on the grid, which would have been with a FindControl().