<CommandBinding Command=”Properties” />
<InputBinding Command=”{x:Static ApplicationCommands.Properties}” />

The first one should be easy to understand.

The second needs some explaining. The x:Static is a XAML-specific thing for assigning properties to static, as in C# static, values; it can be applied anywhere. ApplicationCommands is one of the classes WPF comes with that provides built-in commands.

Perhaps the equivalent code will help:

CommandBinding binding = new CommandBinding();
binding.Command = ApplicationCommands.Properties;
binding.Executed += Properties_Executed;
this.CommandBindings.Add(binding);

InputBinding inputBinding = new InputBinding();
inputBinding.Command = ApplicationCommands.Properties;
inputBinding.Gesture = new KeyGesture(Key.O,
ModifierKeys.Shift | ModifierKeys.Control | ModifierKeys.Alt);
this.InputBindings.Add(inputBinding);

Look on MSDN for ApplicationCommands. There are a couple of other classes like that: NavigationCommands, ComponentCommands and more, but I can’t think of them.

Also, you noted there were two ways to declare the command but I’m not seeing the second way. What am I missing?

Thanks,
Kevin