Workspace layout is defined using tree hierarchy which consists of
sequences that contain additional sequences and/or cells. This allows
complete flexibility in how you organize your layout.
Here you have a single cell in the root sequence with three pages.

Or you might want to create a cell for each page. You can do this in code
or the user might use drag and drop to create this arrangement.

You can have sequences within sequence. Here you can see that on the
right hand side we have a vertical sequence creating a more complex
arrangement.

If you want a grid of cells then just create an equal number of vertical
sequences that contains horizontal sequences. Or just let the control do
this for you using one of the exposed Navigator methods.
