How to change mouse event routing?

I have a Qt Widget which use QWT plotting and it works fine on Qt widget application (zooming, etc.)

But When I try to use it in Qt quick application, the zooming not work.

the QML file:

Code:

---

import QtQuick 1.0 
import Plot 1.0   
 
Rectangle {     
    id: page1     
    color: "#646464"    
    width: parent.width     
    height: parent.height       
    MyPlot {         
        id: thePlot         
        width: parent.width         
        height: parent.height         
        anchors.left: parent.left         
        anchors.top: parent.top
    }
}

---

Inside the QML file, a Qt Widget is called. The Widget is QWT plot widget which can display data and zoom in/out. But the problem is zoom not working any more. The mouse move event seems not send to the widget, it only send to QML Rectangle itself. So how can mouse event routed into widget, not the Rectangle itself?