CheckBox: Publish CheckedChanged event on click
Menu, ToolBar: Leave action changed handlers alone if only visibility changed
MainWindow: Delegate ContextMenu to clientComposite
declarative/MainWindow: Setup menu and tool bar before context menu

This at least improves the situation with ActionRefs a bit, because it seems more likely to add the "proper" actions to the menu of the MainWindow and use ActionRefs in context menus.
Add actions example