If you find that there are too many breeding SplitContainers, you need to reset the level and look at the Splitter controller itself. Suppose for a moment that we are talking about a bunch of horizontal lines, such as:
+-----------+
| Content 1 |
+-----------+
| Content 2 |
+-----------+
| Content 3 |
+-----------+
Content 1 - , . . Splitter . , , , "", Content 1. "Content 2", . Splitter . , "Content 3" "". , .
, , , . "Z-" , , ", " . " " (View → Other Windows → Document Outine Ctrl-W, U). , .