In one embodiment, a user interface system may execute an independent expression in a secondary code set to facilitate taking a dynamic object reading for a target composition object. The user interface system may execute a primary code thread and a secondary code thread for a user interface. The primary code thread may generate an independent expression resident in the secondary code thread. The independent expression may gather an input set resident in the secondary code thread for a target composition object. The secondary code thread may render the target composition object based on the input set.