In a GridControl, you can double click the column border to re-show a hidden column.
In a GridDataBoundGrid, you can handle the ResizingCols event, and make a doubleclick resize things.
private void gridDataBoundGrid1_ResizingColumns(object sender, GridResizingColumnsEventArgs e)
{
if(e.Reason == GridResizeCellsReason.DoubleClick)
{
this.gridDataBoundGrid1.Model.Cols.Hidden[e.Columns.Left+1] = false;
e.Cancel = true;
}
}