void AddRefTarget(GObject target)
{
if (target != _owner.parent)
target.onPositionChanged.Add(__targetXYChanged);
target.onSizeChanged.Add(__targetSizeChanged);
_targetData.x = _target.x;
_targetData.y = _target.y;
_targetData.z = _target._rawWidth;
_targetData.w = _target._rawHeight;
}