IAP one click buy question

[CLTSchwarz]

I'm using the ButtonQMLPlugin from the one click buy example.
In my QML file I want to know when the purchase was successful.
I want to know when purchased() gets emitted but I'm not having any luck!
I get this error code when running my app:
[Qt Message] Button/RestoreButton.qml:29 ButtonQmlUi is not a type

Here is my QML code:

import QtQuick 1.0
import ButtonQmlPlugin 1.0

Rectangle {
    id: screen
    width: 220
    height: 146
    signal click
    onClick: {
        oneClickBuyButton.onPressed();
    } 

    property alias cbLabelTextMainName: oneClickBuyButton.cbLabelTextMainName
    property alias cbLabelTextMainDescription: oneClickBuyButton.cbLabelTextMainDescription
    property alias cbLabelTextMainPrice: oneClickBuyButton.cbLabelTextMainPrice
    property alias cbLabelTextOperation: oneClickBuyButton.cbLabelTextOperation
    property alias cbGifVisibility: animationGif.visible


    ButtonQmlUi {
        id:iap_manager
        onPurchased: {
           console.log("onPurchaseCompleted")
            if( status==="OK") {
               if( productID === "111111" ) {
                   //do stuff here
               }
           }
       }
    }

I thought that is the right way to receive a signal?

Out of interest here is the ButtonQMLUi.h file which processes the payment fine if I take out my attempt to receive that signal

#ifndef EXAMPLEITEM_H
#define EXAMPLEITEM_H

#include <QDeclarativeItem>
#include <QMap>
#include <QVariant>
#include <QRectF>
#include <QTime>

#include <iapclient.h>

class QDeclarativeEngine;
class QDeclarativeView;
class QTranslator;
class QLabel;

class ButtonQmlUi : public QDeclarativeItem
    {
        Q_OBJECT
        // status and tools needed by PageStack

        Q_PROPERTY(QString resourceId READ getResourceId WRITE setResourceId NOTIFY resourceIdChanged)
        Q_PROPERTY(QString cbLabelTextMainName READ getcbLabelTextMainName WRITE setcbLabelTextMainName NOTIFY cbLabelTextMainNameChanged)
        Q_PROPERTY(QString cbLabelTextMainDescription READ getcbLabelTextMainDescription WRITE setcbLabelTextMainDescription NOTIFY cbLabelTextMainDescriptionChanged)
        Q_PROPERTY(QString cbLabelTextMainPrice READ getcbLabelTextMainPrice WRITE setcbLabelTextMainPrice NOTIFY cbLabelTextMainPriceChanged)
        Q_PROPERTY(QString cbLabelTextOperation READ getcbLabelTextOperation WRITE setcbLabelTextOperation NOTIFY cbLabelTextOperationChanged)
        Q_PROPERTY(bool cbLoading READ getcbLoading WRITE setcbLoading NOTIFY cbLoadingChanged)
        
    public:

        void _setResourceId( const QString &theResourceId );

    public slots:
    
        void onPressed();
    
        void onPurchaseCompleted( int requestId, QString status, QString purchaseTicket );
        void onRestorationCompleted( int requestId, QString status, QString purchaseTicket );
        void onRestorableProductsReceived( int requestId, QString status, IAPClient::ProductDataList items );
        void onProductDataReceived( int requestId, QString status, IAPClient::ProductDataHash productData );
        void showLoading();
        void hideLoading();
        
    signals:
        void purchased();
        void error();
        
        void resourceIdChanged();
        void cbLabelTextMainNameChanged();
        void cbLabelTextMainDescriptionChanged();
        void cbLabelTextMainPriceChanged();
        void cbLabelTextOperationChanged();
        void cbLoadingChanged();
    public:
        const QString getResourceId();
        void setResourceId(const QString);
        
        const QString getcbLabelTextMainName();
        void setcbLabelTextMainName(const QString);
        
        const QString getcbLabelTextMainDescription();
        void setcbLabelTextMainDescription(const QString);
        
        const QString getcbLabelTextMainPrice();
        void setcbLabelTextMainPrice(const QString);
        
        const QString getcbLabelTextOperation();
        void setcbLabelTextOperation(const QString);
        
        const bool getcbLoading();
        void setcbLoading(const bool);
    public:
        ButtonQmlUi(QDeclarativeItem *parent = 0);
        virtual ~ButtonQmlUi();
        void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *);

    private:
    //    void verifyTicket( const QString &thePurchaseTicket );

    //    QNetworkAccessManager *mNAM;
    //    QNetworkReply *mNReply;

        IAPClient *mIapClient;
        
        QString m_resourceId;
        
        QString m_cbLabelTextMainName;
        QString m_cbLabelTextMainDescription;
        QString m_cbLabelTextMainPrice;
        QString m_cbLabelTextOperation;
        bool m_cbLoading;

        bool mIsRestorable;
        IAPClient::DrmType mIsRestorableDRM;

        int mRestorableReqId;
        int mRestoreReqId;
        int mPurchaseReqId;
        
        QLabel *mProcessLabel;
        QLabel *mProcessLabelText;
        QLabel *mProcessLabelTextOperation;
        QLabel *mProcessLabelTextMain;
    };


#endif // EXAMPLEITEM_H

I am trying to receive the purchased signal from the ButtonQMLplugin in a QML file and I can't get it to work

Thanks for your help