Click the splitters to toggle them open/collapsed(optional)/closed. If toggleSplitterCollapsedSize is set on the content pane, the pane has the optional collapsed state. Or it only has two states.
Resizable top bar with three states (open/collapsed/closed). The toggleSplitterCollapsedSize is "20px" here.
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+-Popups and Alerts
+-Dojo Tree from Store
+-Calendar
+-Color Picker
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Main panel with a link.
(to check we're copying children around properly).
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Initialized closed
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Resizable bottom bar which background color is changed when the toggle button is clicked.