[MonoTouch] openGL Y axis rotation

[Gargamelle]

Hello,
I can't understand why the Y rotation stays to 0 in the following example.
I use the device as a camera. I trace in the Label the 3 values I get from
rotation.
X and Z work fine, Y is 0.
If anybody have an idea of my mistake...
Thank you in advance
Denys

Initialisation

...
//View
matWorld = Matrix4.Identity; // permet d'initialiser la matrice avec une
valeur connue
aspectRatio = (float)(Size.Width) / (float)(Size.Height);
matProjection = Matrix4.CreatePerspectiveFieldOfView (((float)(Math.PI) /
180.0f) * 45.0f,
			                                                      aspectRatio, 1.0f,
20.0f);
matView = Matrix4.CreateTranslation (0f, 0f, 8f);
matWorldViewProjection = matWorld * matView * matProjection;
...
Start animating

...
motionManager.StartGyroUpdates (NSOperationQueue.MainQueue,
GyroData_Received);
...
Observing motion

private void GyroData_Received (CMGyroData gyroData, NSError error)
{
	if(currentDeviceMotion != null)
	{
		gyroRotX = -(float)currentDeviceMotion.Attitude.Pitch;
		gyroRotY = -(float)currentDeviceMotion.Attitude.Yaw;
		gyroRotZ = -(float)currentDeviceMotion.Attitude.Roll;
		la_debug.Text = string.Format
				("gyro X: {0:00000} \nY: {1:00000} \nZ: {2:00000}",
				 gyroRotX, gyroRotY, gyroRotZ);
	}
}



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