These events call user-defined handlers (if there are any) and pass the following parameter:

• itemId - id of the item.

      dhxLayout.attachEvent("onDock", function(itemId){});
      dhxLayout.attachEvent("onUnDock", function(itemId){});

For example, let's attach an event handler for “onDock” event:

      dhxLayout.attachEvent("onDock", function(a){
          alert("The item was docked");
      });

Now, when we dock the Layout item “a”, we'll get the specified alert.