You can stick

defaults: { handler: tapHandler }

on a toolbar so that all buttons call the same handler:

 var tapHandler = function (btn, evt) {
   alert("Button '" + btn.text + "' tapped.");
 }

Good example:

 {
 xtype: 'toolbar',
 title: 'Buttons',
 ui: 'dark',
 dock: 'top',
 items: [
        { ui: 'back', text: 'Back' },
        { xtype: 'spacer' },
        { ui: 'forward', text: 'Forward' }
        ]
,defaults: { handler: tapHandler }
 }

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