Add "un-maximize" button that gets the previous panels' visibility state back
The MultiPanelView component suite allows configuring some panels with a "maximize" button. This button closes every other open panel allowing the remaining one to take the entire vertical space and avoiding having an outer vertical scrollbar.
There is a usability issue when the user maximizes a panel and wants to un-maximize it so it can look at another panel. In this case, the user needs to open the closed panels from the upper button bar.
Add a 'restore'/'unmaximize' button that sets the panel visibility states to whatever it was before the user clicked the maximize button.
Offering a 'close' (X) button on maximized panels may not be what we want because there's no use in a panel-less UI. We might be able to save screen real estate by not showing it when the panel is maximized and just offering the un-maximize button.