CustomInspector.AlignTo

    private void AlignTo(AlignToType to , AxisFlag axis)
    {
        Transform[] selectedTransforms = Selection.transforms;

        int targetIndex = 0;
        if (to == AlignToType.lastSelected)
            targetIndex = selectedTransforms.Length - 1;

        for (int i = 0; i < selectedTransforms.Length; i++)
        {
            if (i == targetIndex)
                continue;

            Vector3 temp = selectedTransforms[i].position;

            if ((axis & AxisFlag.X) == AxisFlag.X)
                temp.x = selectedTransforms[targetIndex].position.x;

            if ((axis & AxisFlag.Y) == AxisFlag.Y)
                temp.y = selectedTransforms[targetIndex].position.y;

            if ((axis & AxisFlag.Z) == AxisFlag.Z)
                temp.z = selectedTransforms[targetIndex].position.z;

            Undo.RecordObject(
                selectedTransforms[i],
                selectedTransforms[i].name +  " aligned to " + selectedTransforms[targetIndex].name);

            selectedTransforms[i].position = temp;
        }
    }