[FIXED][3.0rc1.1] hbox layout messing with form fields heights

[usiw]

I am trying to achieve a flex based horizontal layout of fields and hbox is giving me issues. Here is what I am trying to achieve:

+-FormPanel-----------------------------------------+
|                                                   |
|  +-FieldSet-(hbox layout)----------------------+  |
|  |                                             |  |
|  |  TextField#1 [       ] TextField#2 [      ] |  |
|  |                                             |  |
|  +---------------------------------------------+  |
|                                                   |
+---------------------------------------------------+

But what happens is the text fields inside the FieldSet show up as only a pixel or two high. I don't want to set the height as that is always an ugly workaround. Using a column layout resolves the issue but hbox should produce nearly identical results, just without the hassle of setting percentages. Here is the sample code:

    var viewport = new Ext.Viewport({
        items: {
            xtype: 'form',                    
            items: [{
                xtype: 'fieldset',
                title: 'Fieldset',                        
                layout: 'hbox',
                defaults: {
                    layout: 'form',
                    defaultType: 'textfield'                            
                },
                items: [{
                    flex: 1,
                    items: {
                        fieldLabel: 'Field 1'
                    }
                }, {
                    flex: 1,
                    items: {
                        fieldLabel: 'Field 2'
                    }
                }, {
                    flex: 1,
                    items: {                                    
                        fieldLabel: 'Field 3'
                    }                                
                }]
                
            }]
        }
    });

Is this possibly a bug?