Dynamically adding a tab to a TabView can result in two tabs with the same name

If you dynamically add a tab to a tabview too early in initialization, it creates an extra tab with the same name, but no contents.

The example below should have a single tab named 'A Tab' with a blue rectangle filling it. Instead it results in two tabs named 'A Tab', with the first being empty, and the second having the blue rectangle in it.

import QtQuick 2.1
import QtQuick.Controls 1.0

Item {
  id: root

  TabView {
    id: tabview
    anchors.fill: parent
  }

  Component {
    id: dynamic
    Rectangle {
      color: 'blue'
    }
  }

  Component.onCompleted: {
    tabview.addTab('A Tab', dynamic);
  }
}