Problem with Rotation of qml element

[LaurianeLt]

Hi,
I have created a qml element that is a compass, and I want to be able to rotate it in my main window. The problem is that it appears that only the part that was visible at first (before the rotation) rotates.
Here are some screenshots before and after the rotation so that you can understand better.
before the rotation
after the rotation

My compass qml element name is Compas, so in my "main.qml" I'm writing :
Compas {
transform : Rotation {origin.x : width/2 ; origin.y : height/2 ; angle : 40 }
}

Thanks for your help !