gwt menu implementation

[abhishek2408]

I want to implement menu in GWT as shown on this website:

http://www.openkm.com/en/

I have created the menu system and I am able to display alerts from menu using following code:

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Command cmd = new Command() {

public void execute() {

     Window.alert("Menu item have been selected");

               }

}

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I want to get rid of window.alert() and display my application pages from menu.