Tabsheet with Panel Inside

Hello,

I want to disable tabsheet's scroling feature and have a scrolling panel as one of the contents of the tabsheets tab. So basicaly I want only part of the tab's content be scrollable. I add a panel to the the tab content as can be seen in the code. However, I get the tab scrolling instead of the panel. please help... :)  Here is my code.

TabSeet tabs = new TabSheet();
tabs.setSizeFull();
tabs.addStyleName(ValoTheme.TABSHEET_FRAMED);
tabs.addStyleName(ValoTheme.TABSHEET_PADDED_TABBAR);



// Tab Content.
VerticalLayout layout = new VerticalLayout();
setSizeFull();

CssLayout actionBarLayout = new CssLayout();

Button bAddFile = new Button(FontAwesome.PLUS_SQUARE);
bAddFile.addStyleName(ValoTheme.BUTTON_BORDERLESS);
bAddFile.addStyleName(ValoTheme.BUTTON_ICON_ONLY);
bAddFile.addStyleName(ValoTheme.BUTTON_PRIMARY);
bAddFile.addStyleName(ValoTheme.BUTTON_ICON_ALIGN_TOP);

Button bDeleteFile = new Button(FontAwesome.TRASH);
bDeleteFile.addStyleName(ValoTheme.BUTTON_BORDERLESS);
bDeleteFile.addStyleName(ValoTheme.BUTTON_ICON_ONLY);
bDeleteFile.addStyleName(ValoTheme.BUTTON_ICON_ALIGN_TOP);
actionBarLayout.addComponents(bAddFile,bDeleteFile);
layout.addComponent(actionBarLayout);

Panel filesPanel = new Panel();
filesPanel.setSizeFull();

CssLayout filesContainer = new CssLayout();
filesContainer.setHeightUndefined();
Image image1 = new Image();
image1.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image1);
Image image2 = new Image();
image2.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image2);
Image image3 = new Image();
image3.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image3);
Image image4 = new Image();
image4.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image4);
Image image5 = new Image();
image5.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image5);
Image image6 = new Image();
image6.setSource(new ExternalResource("https://cdn1.iconfinder.com/data/icons/ios-7-style-metro-ui-icons/512/MetroUI_Windows8_Photos.png"));
filesContainer.addComponent(image6);

filesPanel.setContent(filesContainer);
layout.addComponent(filesPanel);

//Add to tabsheet
tabSheet.addTab(layout,"Tab 1");