Problems with positioners

Hi,
I've got some problems with positioners:
My code is

Code:

---

import QtQuick 1.1
import com.nokia.meego 1.0
 
Page
{
  //  property int items:  5
   // property int itemheight: screenheight / items - screenheight
    id: mainPage
    tools: maintoolbar
 
    Loader
    {
        id: goLoader
        onLoaded: console.log("Show lyrics page loaded")
    }
    Loader
    {
        id: selectTrackLoader
        onLoaded: console.log("Select track page loaded")
    }
 
    EditTrackDataSheet
    {
        id: edittrackdatasheet
    }
 
    Column
    {
        width: parent.width
        Rectangle
        {
            color: "#4591ff"
            height: 72
            width: parent.width
            Text
            {
                text: "Search for lyrics"
                color: "white"
                anchors
                {
                    verticalCenter: parent.verticalCenter
                    left: parent.left
                    leftMargin: 30
                }
                font.pixelSize: 48
            }
        }
 
        CheckBox
        {
            id: tracksrc
            text: "Select track from library" // label isn't needed with PageStackWindow
            checked: true
            anchors.horizontalCenter: parent.horizontalCenter
            //checkable: true
        }
 
        // button for selecting a track from the media library
        Row
        {
            Text
            {
                id: selectedtracktext
                text: "Selected track:  "
            }
 
            Button
            {
                id: selecttrack
                checkable: false
                text: "<i>No track selected</i>"
                width: parent.width - selectedtracktext.width
                onClicked:
                {
                    if ( tracksrc.checked  )
                    {
                        selectTrackLoader.source = "SelectTrackPage.qml"
                        pageStack.push(selectTrackLoader.item)
                    }
                    else
                    {
                        edittrackdatasheet.open()
                    }
                }
            }
        }
 
        //line edits for entering the data manually
 
        Button
        {
            id: lyricssrcbutton
            text: lyricssrcdialog.model.get(lyricssrcdialog.selectedIndex).name
            width: parent.width
            onClicked: { lyricssrcdialog.open(); }
        }
 
        Button
        {
            id: go
            text: "Go!"
            width: parent.width
            onClicked:
            {
                goLoader.source = "ShowLyricsPage.qml"
                pageStack.push(goLoader.item)
            }
        }
    }
    ToolBarLayout
    {
        id: maintoolbar
        ToolIcon
        {
            iconId: "toolbar-back"
            onClicked: quitdialog.open()
        }
    }
    SelectionDialog
    {
        id: lyricssrcdialog
        titleText: "Download source"
        selectedIndex: 0
        model: ListModel
        {
            ListElement { name: "AZLyrics" }
        }
    }
 
    QueryDialog
    {
        id: notimplementeddialog
        acceptButtonText: "OK"
        message: "Sorry! Not implemented yet!"
    }
 
    QueryDialog
    {
        id: quitdialog
        acceptButtonText: "OK"
        rejectButtonText: "Cancel"
        message: "Are you sure you want to quit MaeLyrica?"
        onAccepted: Qt.quit()
    }
 
}

---

Unfortunately, the Row is positioned somewhere in the top (as in screenshot) and should be below the checkbox.
What am I doing wrong?
Thanks in advance