I know it is possible to show/hide columns through the column menu, but there is something odd about being able to hide one column from another column's menu. Alternative is to implement something yourself and use the API to show/hide a column, this seems like something that should be an option in the grid. I am imagining a column chooser button (perhaps in the top left header) that opens up a list of checkboxes similar to what you see in the column menu.