Custom Panels
One common type of custom element is a custom panel. As you learned in Chapter 4, panels host one or more children and implement specific layout logic to arrange them appropriately. Custom panels are an essential ingredient if you want to build your own system for tear-off toolbars or dockable windows. Custom panels are often useful when creating composite controls that need a specific nonstandard layout. For example, you could create a custom panel as part of an Office 2007-style "ribbon" that rearranges and resizes its buttons dynamically as the available space changes.
You're already familiar with the basic types of panels that WPF includes for organizing content (such as the StackPanel, DockPanel, WrapPanel, Canvas, and Grid). ...
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