Data Grid Expand All Button

Hi there.
I am using the Data Grid and hierarchy.
What I want to do is have an "Expand All" button in the grid header that will expand all the items in the grid.
Similar to this (I just drew a "+" that would be to expand all and a "-" to collapse):

Is this possible, and if so how :slight_smile:

Thanks, Jeremy

There is no way at the moment to place anything in this column header - i.e. there is no ExpandColumnHeader property however we accept pull requests!