PinchHandler scale bounds

Rectangle{   
   x: 0 
   y: 0 
   height: 100 
   width: 100
   color: "blue"        
   anchors.fill: parent       
   Rectangle{            
       x: 10           
       y: 10            
       height: 10            
       width: 10           
       PinchHandler{
                minimumScale: 0.5
                maximumScale: 2
            }
        }
}