Gestures, events, and commands

Classes that expose a command property in WPF and Silverlight are implementing the ICommandSource interface that is shown in the following code:

//     Defines an object that knows how to invoke a command.
public interface ICommandSource
{
    //     The command that will be executed when the command 
           source is invoked.
    ICommand Command { get; }
    //     Represents a user defined data value that can be 
           passed to the command when it is executed.
    object CommandParameter { get; }
    //     The object that the command is being executed on.
    IInputElement CommandTarget { get; }
}

One major limitation of the commanding infrastructure is that ICommandSource only allows for one action on a command source to be associated with a command. So, for example, if you want to have commands executed for both left-click and right-click on a button, you wouldn't be able to accomplish that using the Button.Command property. This limitation is...