===== Can't use the phone's menu button? =====
Things are not quite as straightforward with android menu buttons as they used to be.
==== How it used to work ====
Each android phone came with a menu button.

When the user pressed it, the appropriate menu was displayed.

**app.SetMenu** is supplied to define the appropriate menu(s) in your app.
==== But my phone/tablet has no menu button ====
Unfortunately, it is becoming much more common for devices not to provide a menu button.

==== How to show the menu anyway ====
**app.ShowMenu()** can be used from your code to display the menu.\\
The most appropriate way to call this is usually from a button.

However, if you are very short of screen space, it may be easier to hijack the device's Back Button instead.

If you do this, don't forget to leave a way to exit the app.

Some sample code is included here to show a way to do this.
===== Sample code =====
<code JavaScript backButtonMenu.js>
//Called when application is created.  
function OnStart()
{     
    app.SetMenu( "Exit,Model,Display" );  
    app.EnableBackKey( false );  
    app.ShowPopup ( "Back key emulates Menu key" ); 
}  

//Called when user selects a menu item.  
function OnMenu( name )
{           
    if ( name == "Exit" ) app.Exit() ; 
    if ( name == "Model" ) app.ShowPopup( app.GetModel() ); 
    if ( name == "Display" ) 
    {
        var s = app.GetDisplayWidth() + " x " + app.GetDisplayHeight();
        app.ShowPopup( s );
    }
}  

//Called when the back key is pressed.  
function OnBack()
{ 
  app.ShowMenu(); 
}  

</code>