Event providing to QWidget(QWT) embedded into QML Qt4

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Hi, I've used QwtPlot (Qwt 6.0.1) in QML project (Qt 4.8) . i'm wrap it via QDeclarativeItem

@ GraphWidgetQML::GraphWidgetQML(QDeclarativeItem *parent):QDeclarativeItem(parent)
{
_GraphArea = new GraphWidget; //child of QwtPlot without event handlers overrides
QGraphicsProxyWidget *_wiget = new QGraphicsProxyWidget(this);
_wiget->setWidget(_GraphArea);
_wiget->setFlag(QGraphicsItem::ItemIsFocusable,true);
this->setClip(true);
}@

and insert into into QML via code

@ qmlRegisterType<GraphWidgetQML> ("GraphWidget",1,0,"GraphWidget"); //registration type@

and QML

@ GraphWidget {
id: drawer

        objectName: "drawer"

        anchors.top: parent.top
        anchors.bottom: parent.bottom
        anchors.left: parent.left
        anchors.right: parent.right
        //
        anchors.topMargin: 5
        anchors.bottomMargin: 5
        anchors.leftMargin: 5
        anchors.rightMargin: 5
    }@

But, Mouse evets won't work correctly. For example when i want to draw a zooming rectangle, when i released the mouse button it won't zoom untill press enter key. Right button doesn't work at all.

How to make proper event providing?