QML Flickable doesn't scroll properly

[super33]

I am a beginner in QML, so I apologize if this seems like an obvious question. I am trying to make a simple browser and I have put the WebView inside the Flickable. But the problem is when I drag the WebView within the flickable to scroll, it just bounces back to its original position. My code looks like this:
import QtQuick 1.1
import QtWebKit 1.0

Rectangle
{
id: windowcontainer
width: 1024
height: 768

@ Rectangle
{
id: controlscontainer
width: parent.width
height: 40
color: "#1478ca"

    Rectangle
    {
        id: urlcontainer
        x: 8
        y: 10
        width: controlscontainer.width-100
        height: 20

        TextEdit
        {
            id: urlbox
            width: urlcontainer.width
            height: urlcontainer.height
            text: web_view.url

            Keys.onReturnPressed:
            {
                web_view.url = urlbox.text
            }

        }
     }
}

Rectangle
{
    id: webcontainer
    x: 0
    y: 40
    width: windowcontainer.width
    height: 416

    Flickable
    {
        id: viewcontainer
        interactive: true
        width: web_view.height
        height: web_view.height
        contentHeight: web_view.preferredHeight
        contentWidth: web_view.preferredWidth
        boundsBehavior: Flickable.DragOverBounds

        WebView
        {
            id: web_view
            url: "http://www.google.com/"
            preferredWidth: webcontainer.width
            preferredHeight: webcontainer.height
        }
    }
}

}@

Is there anyway I can fix this? Any help would be appreciated. Thank in advance!

[Jens]

There is a contradiction in your webcontainer item.

You say that the content height of your flickable is equal to the web_view height. And you say that the web_view height is equal to the webcontainer height. The only way to interpret this is that the flickable contentArea has the same height as its parent which should in exactly the behaviour you describe. I suspect it will work if you don't explicitly override the preferred height of the web_view