The source code

    Ext.onReady(function(){
        var simple = new Ext.FormPanel({
            labelWidth: 40, // label settings here cascade unless overridden
            frame: true,
            title: 'Simple Form',
            bodyStyle: 'padding:5px 5px 0',
            width: 210,
            defaults: {width: 135},
            defaultType: 'textfield',

            items: [
                new Ext.ux.form.SpinnerField({
                    fieldLabel: 'Age',
                    name: 'age'
                }),
                {
                	xtype: 'spinnerfield',
                	fieldLabel: 'Test',
                	name: 'test',
                	minValue: 0,
                	maxValue: 100,
                	allowDecimals: true,
                	decimalPrecision: 1,
                	incrementValue: 0.4,
                	alternateIncrementValue: 2.1,
                	accelerate: true
                }
            ]
        });

        simple.render('form-ct');
    });