When createting Rectangles with Repeater element and tries to set opacity to 0 in Component.onCompleted unexpectedly 2 Rectangles disseppear.

When creates Rectangles with Repeater element and tries to set opacity to 0 in Component.onCompleted unexpectedly 2 Rectangles seem to disseppear. When degugged it with my QtCreator I notice that one Rectangle actually doesn't disappear, but goes under other element (check x property of last Rectangle). Run code below . Unexpectedly two rectangles disappear.

import Qt 4.7

Rectangle {
width: 640
height: 480

Component.onCompleted:

{ grid.children[2].opacity = 0; }

Grid{
id: grid
rows: 2
columns: 4
spacing: 2
Repeater{
model: 5
delegate: Rectangle

{width: 50-(index*5); height: 50-(index*5); color: "red"}

}
}
}