http://www.xulplanet.com/tutorials/xultu/commands.html http://www.xulplanet.com/reference/elemref/ref_command.html A command element can be used to invoke an operation that can come from multiple sources. For example, a clipboard paste operation can be invoked from the Edit menu, a context menu and by pressing a keyboard shortcut. You attach the code to the command using the oncommand attribute. It will be called no matter how it is invoked by the user. In addition, disabling the command will automatically disable the menu items and keyboard shortcuts. Commands are identified by their id. If you include the script chrome://global/content/globalOverlay.js in your window, you can use the function goDoCommand function to invoke the command. Using this function has the advantage that the command will be sent to the part of the UI which will respond to it. Typically, this will be the currently focused element. For example, the following code will sent a paste command (cmd_paste) to the currently focused element: goDoCommand("cmd_paste"); Like a broadcaster, commands forward attributes to other elements. A command element can be used to invoke an operation that can come from multiple sources. For example, a clipboard paste operation can be invoked from the Edit menu, a context menu and by pressing a keyboard shortcut. You attach the code to the command using the oncommand attribute. It will be called no matter how it is invoked by the user. In addition, disabling the command will automatically disable the menu items and keyboard shortcuts.

Commands are identified by their id. If you include the script chrome://global/content/globalOverlay.js in your window, you can use the function goDoCommand function to invoke the command. Using this function has the advantage that the command will be sent to the part of the UI which will respond to it. Typically, this will be the currently focused element. For example, the following code will sent a paste command (cmd_paste) to the currently focused element:

  goDoCommand("cmd_paste");

Like a broadcaster, commands forward attributes to other elements.

]]> If you set the disabled attribute to true, any menu items and keys attached to the command become disabled. If you remove the disabled attribute, the menu items and keys become enabled. The label inherited by the menu items and keys that are attached to the command. This event handler is called when the command is activated. This occurs when a user selects a menu item or presses a keyboard shortcut attached to the command.