Hi Mouseman -
Are you asking how to make view scheme trees in the left-side panel, ala 9.0? If so, here's the procedure:
Create your new view scheme with the Media Library right-click menu. If you choose 'Custom' you'll immediately get to define properties in a popup window. The same window can be called with 'Edit Selected View Scheme' from the right-click menu of the view scheme.
In this popup, choose 'Populate Tree' - this just tells MC to let you use a tree instead of just panes for that view scheme.
Make sure your view scheme is selected and that panes are visible. Choose the panes you want to display by right or left clicking on the column header - if it's a new custom scheme this will say 'Empty (click here to configure)'. So with this menu you can add or remove panes and move them left or right. Each pane that you add will be a level of the tree. The leftmost pane will be the highest level of branch in the tree. The next pane to the right will be a branch nested under the first, and so on.
Reading the above seems more complicated than it is in practice. There doesn't seem to be any way to avoid using the panes to set up or configure the tree. Apologies if this is not even what you were asking for