Show/Hide Nested Columns

[[email protected]]

I have a grid with nested columns.  When I show and hide one of the child columns within a column group, it works fine.  But if I hide all of the children for a particular column group, and then attempt to show one of them again, the entire column group stays hidden.  Is this a known problem?  Is there some trick to getting the entire column group to refresh?
If all of the children have hidden=true, then the column group disappears.  That's good.  But then if one of the children is given hidden = false, the column group does NOT reappear.

[paramvir]

When all the children columns are hidden, grid marks the parent columns as hidden too.

When you show one of the child columns, you would need to show its parent columns too by setting hidden = false for parent columns.