Vaadin regression in 7 beta10 where Panels inside TabSheets do not correctly render (don't render at all).

gistfile1.txt

package com.example.tabby9;

import com.vaadin.annotations.AutoGenerated;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Label;
import com.vaadin.ui.NativeButton;
import com.vaadin.ui.Panel;
import com.vaadin.ui.TabSheet;
import com.vaadin.ui.VerticalLayout;

public class Tabby extends CustomComponent {

  @AutoGenerated
  private VerticalLayout mainLayout;
  @AutoGenerated
  private TabSheet tabSheet_1;
  @AutoGenerated
  private VerticalLayout verticalLayout_5;
  @AutoGenerated
  private Panel panel_4;
  @AutoGenerated
  private VerticalLayout verticalLayout_6;
  @AutoGenerated
  private NativeButton nativeButton_3;
  @AutoGenerated
  private Label label_5;
  @AutoGenerated
  private Label label_4;
  @AutoGenerated
  private Panel panel_3;
  @AutoGenerated
  private VerticalLayout verticalLayout_4;
  @AutoGenerated
  private Label label_3;
  @AutoGenerated
  private Panel panel_2;
  @AutoGenerated
  private VerticalLayout verticalLayout_3;
  @AutoGenerated
  private NativeButton nativeButton_2;
  @AutoGenerated
  private Label label_2;
  @AutoGenerated
  private Panel panel_1;
  @AutoGenerated
  private VerticalLayout verticalLayout_2;
  @AutoGenerated
  private Label label_1;
  @AutoGenerated
  private NativeButton nativeButton_1;

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  private static final long serialVersionUID = 1L;

  /*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

  /**
   * The constructor should first build the main layout, set the composition
   * root and then do any custom initialization.
   * 
   * The constructor will not be automatically regenerated by the visual editor.
   */
  public Tabby() {
    buildMainLayout();
    setCompositionRoot(mainLayout);

    // TODO add user code here
  }

  @AutoGenerated
  private VerticalLayout buildMainLayout() {
    // common part: create layout
    mainLayout = new VerticalLayout();
    mainLayout.setImmediate(false);
    mainLayout.setWidth("100%");
    mainLayout.setHeight("100%");
    mainLayout.setMargin(false);

    // top-level component properties
    setWidth("100.0%");
    setHeight("100.0%");

    // tabSheet_1
    tabSheet_1 = buildTabSheet_1();
    mainLayout.addComponent(tabSheet_1);

    return mainLayout;
  }

  @AutoGenerated
  private TabSheet buildTabSheet_1() {
    // common part: create layout
    tabSheet_1 = new TabSheet();
    tabSheet_1.setImmediate(true);
    tabSheet_1.setWidth("100.0%");
    tabSheet_1.setHeight("100.0%");

    // panel_1
    panel_1 = buildPanel_1();
    tabSheet_1.addTab(panel_1, "Tab 1", null);

    // panel_2
    panel_2 = buildPanel_2();
    tabSheet_1.addTab(panel_2, "Tab 2", null);

    // panel_3
    panel_3 = buildPanel_3();
    tabSheet_1.addTab(panel_3, "Tab 3", null);

    // verticalLayout_5
    verticalLayout_5 = buildVerticalLayout_5();
    tabSheet_1.addTab(verticalLayout_5, "Vertical Layout", null);

    return tabSheet_1;
  }

  @AutoGenerated
  private Panel buildPanel_1() {
    // common part: create layout
    panel_1 = new Panel();
    panel_1.setImmediate(false);
    panel_1.setWidth("-1px");
    panel_1.setHeight("-1px");

    // verticalLayout_2
    verticalLayout_2 = buildVerticalLayout_2();
    panel_1.setContent(verticalLayout_2);

    return panel_1;
  }

  @AutoGenerated
  private VerticalLayout buildVerticalLayout_2() {
    // common part: create layout
    verticalLayout_2 = new VerticalLayout();
    verticalLayout_2.setImmediate(false);
    verticalLayout_2.setWidth("100.0%");
    verticalLayout_2.setHeight("100.0%");
    verticalLayout_2.setMargin(false);

    // nativeButton_1
    nativeButton_1 = new NativeButton();
    nativeButton_1.setCaption("NativeButton");
    nativeButton_1.setImmediate(true);
    nativeButton_1.setWidth("-1px");
    nativeButton_1.setHeight("-1px");
    verticalLayout_2.addComponent(nativeButton_1);

    // label_1
    label_1 = new Label();
    label_1.setCaption("I am Label in tab 1");
    label_1.setImmediate(false);
    label_1.setWidth("-1px");
    label_1.setHeight("-1px");
    label_1.setValue("Label");
    verticalLayout_2.addComponent(label_1);

    return verticalLayout_2;
  }

  @AutoGenerated
  private Panel buildPanel_2() {
    // common part: create layout
    panel_2 = new Panel();
    panel_2.setImmediate(false);
    panel_2.setWidth("100.0%");
    panel_2.setHeight("100.0%");

    // verticalLayout_3
    verticalLayout_3 = buildVerticalLayout_3();
    panel_2.setContent(verticalLayout_3);

    return panel_2;
  }

  @AutoGenerated
  private VerticalLayout buildVerticalLayout_3() {
    // common part: create layout
    verticalLayout_3 = new VerticalLayout();
    verticalLayout_3.setImmediate(false);
    verticalLayout_3.setWidth("100.0%");
    verticalLayout_3.setHeight("100.0%");
    verticalLayout_3.setMargin(false);

    // label_2
    label_2 = new Label();
    label_2.setCaption("I am a label in tab 2");
    label_2.setImmediate(false);
    label_2.setWidth("-1px");
    label_2.setHeight("-1px");
    label_2.setValue("Label");
    verticalLayout_3.addComponent(label_2);

    // nativeButton_2
    nativeButton_2 = new NativeButton();
    nativeButton_2.setCaption("NativeButton");
    nativeButton_2.setImmediate(true);
    nativeButton_2.setWidth("-1px");
    nativeButton_2.setHeight("-1px");
    verticalLayout_3.addComponent(nativeButton_2);

    return verticalLayout_3;
  }

  @AutoGenerated
  private Panel buildPanel_3() {
    // common part: create layout
    panel_3 = new Panel();
    panel_3.setImmediate(false);
    panel_3.setWidth("100.0%");
    panel_3.setHeight("100.0%");

    // verticalLayout_4
    verticalLayout_4 = buildVerticalLayout_4();
    panel_3.setContent(verticalLayout_4);

    return panel_3;
  }

  @AutoGenerated
  private VerticalLayout buildVerticalLayout_4() {
    // common part: create layout
    verticalLayout_4 = new VerticalLayout();
    verticalLayout_4.setImmediate(false);
    verticalLayout_4.setWidth("100.0%");
    verticalLayout_4.setHeight("100.0%");
    verticalLayout_4.setMargin(false);

    // label_3
    label_3 = new Label();
    label_3.setImmediate(false);
    label_3.setWidth("-1px");
    label_3.setHeight("-1px");
    label_3.setValue("Label");
    verticalLayout_4.addComponent(label_3);

    return verticalLayout_4;
  }

  @AutoGenerated
  private VerticalLayout buildVerticalLayout_5() {
    // common part: create layout
    verticalLayout_5 = new VerticalLayout();
    verticalLayout_5.setImmediate(false);
    verticalLayout_5.setWidth("100.0%");
    verticalLayout_5.setHeight("100.0%");
    verticalLayout_5.setMargin(false);

    // label_4
    label_4 = new Label();
    label_4.setImmediate(false);
    label_4.setWidth("-1px");
    label_4.setHeight("-1px");
    label_4.setValue("Label");
    verticalLayout_5.addComponent(label_4);

    // label_5
    label_5 = new Label();
    label_5.setImmediate(false);
    label_5.setWidth("-1px");
    label_5.setHeight("-1px");
    label_5.setValue("Label");
    verticalLayout_5.addComponent(label_5);

    // panel_4
    panel_4 = buildPanel_4();
    verticalLayout_5.addComponent(panel_4);

    return verticalLayout_5;
  }

  @AutoGenerated
  private Panel buildPanel_4() {
    // common part: create layout
    panel_4 = new Panel();
    panel_4.setImmediate(false);
    panel_4.setWidth("100px");
    panel_4.setHeight("30px");

    // verticalLayout_6
    verticalLayout_6 = buildVerticalLayout_6();
    panel_4.setContent(verticalLayout_6);

    return panel_4;
  }

  @AutoGenerated
  private VerticalLayout buildVerticalLayout_6() {
    // common part: create layout
    verticalLayout_6 = new VerticalLayout();
    verticalLayout_6.setImmediate(false);
    verticalLayout_6.setWidth("100.0%");
    verticalLayout_6.setHeight("100.0%");
    verticalLayout_6.setMargin(false);

    // nativeButton_3
    nativeButton_3 = new NativeButton();
    nativeButton_3.setCaption("I'm in the panel");
    nativeButton_3.setImmediate(true);
    nativeButton_3.setWidth("-1px");
    nativeButton_3.setHeight("-1px");
    verticalLayout_6.addComponent(nativeButton_3);

    return verticalLayout_6;
  }

}