title: QML disappearing objects
body: <p>I have issue with disappearing item. If there is just "loginBox" - it looks fine:
  <img src="https://screenshu.com/static/uploads/temporary/2v/z9/8p/1kxn3v.jpg" alt="looks fine">
  But when i'm adding "savedAccountsBox", "loginBox" disappears, there is just "savedAccountsBox":
  <img src="https://screenshu.com/static/uploads/temporary/34/3v/7g/g82bn0.jpg" alt="doesn&#39;t look nice">
  Also the structur seems to be fine:</p>
  
  <p><img src="https://screenshu.com/static/uploads/temporary/y3/ab/zl/kydtho.jpg" alt="good structure"></p>
  
  <p>What is wrong?
  This is my code:</p>
  
  <pre><code>ApplicationWindow {
      id: applicationWindow1
      visible: true
      width: 640
      height: 480
      title: qsTr("Hello World")
  
      menuBar: MenuBar {
          Menu {
              title: qsTr("File")
              MenuItem {
                  text: qsTr("Exit")
                  onTriggered: Qt.quit();
              }
          }
      }
  
  
      GridLayout {
              anchors.fill: parent
              //anchors.margins: 20
              //rowSpacing: 20
              //columnSpacing: 20
              //flow:  width &gt; height ? GridLayout.LeftToRight : GridLayout.TopToBottom
  
              TabView {
                  Layout.fillWidth: true
                  Layout.fillHeight: true
                  Tab {
                      title: "Accounts"
  
                      GroupBox {
                          id: loginBox
                          x: parent.width * 0.05
                          y: parent.height * 0.05
                          width:  parent.width * 0.4
                          height: parent.height * 0.9
                          title: "Login"
  
                          TextArea {
                              id: textArea1
                              x: parent.width * 0.125
                              y: parent.height * 0.125
                              width:  parent.width * 0.15
                              height: parent.height * 0.07
                          }
                      }
  
                      GroupBox {
                          id: savedAccountsBox
                          x: parent.width * 0.6
                          y: parent.height * 0.05
                          width:  parent.width * 0.3
                          height: parent.height * 0.9
                          title: "Saved Accounts"
  
                          ListView {
                              id: listView1
                              x: parent.width * 0.1
                              y: 0
                              displayMarginBeginning: -50
                              //anchors.centerIn: parent
                              width:  parent.width * 0.5
                              height: parent.height * 0.7
                              spacing: 10
                              scale: 1.6
                              delegate: Item {
                                  x: 5
                                  width: 80
                                  height: 40
                                  Row {
                                      id: row1
                                      spacing: 10
                                      Rectangle {
                                          width: 40
                                          height: 40
                                          color: colorCode
                                      }
  
                                      Text {
                                          text: name
                                          font.bold: true
                                          anchors.verticalCenter: parent.verticalCenter
                                      }
                                  }
                              }
  
                              model: ListModel {
                                  ListElement {
                                      name: "Grey"
                                      colorCode: "grey"
                                  }
  
                                  ListElement {
                                      name: "Red"
                                      colorCode: "red"
                                  }
  
                                  ListElement {
                                      name: "Blue"
                                      colorCode: "blue"
                                  }
                              }
                          }
                      }
  
                  }
  
  
  
  
                  Tab {
                      title: "Blue"
                  }
                  Tab {
                      title: "Green"
                  }
              }
      }
  }
  </code></pre>