title: Sencha Touch Vertical Scroll Issue
body: <p>I have a list with a button at the bottom, you only see the button if you scroll to the bottom.  When I turn my phone landscape mode it allows me to scroll but not with it is in portrait mode.  I can't figure out why I can scroll in one view but not the other??</p>
  
  <p>here is my config code:</p>
  
  <pre><code>var config = {
          cls: 'customizationScreen',
          titlebarTitle: 'Customize',
          scroll: 'vertical',
          layout: {
              type: 'vbox'
              },
          items: [
              {
                  scroll: 'vertical',
                  xtype: 'container',
                  items: [this.customizationList]
              },
              {
                  layout: {
                      type: 'hbox',
                      align: 'center',
                      pack: 'center'
                      },
                  defaults: {
                          xtype: 'button',
                          baseCls: 'greyButtonUp orderButton',
                          pressedCls: 'greyButtonDown'
                  },
                  items: [
                      {
                          text: 'Check-Out',
                          handler: Ext.createDelegate(this.onCheckOutClick, this)
                      }
                  ]
              }
          ]
  
      };
  </code></pre>
  
  <p>Any suggestions, thanks so much?</p>