how to change mouse message routing?

I have a 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?