[Paraview] Temporal Interpolator + Append Attributes

[Dr. X]

Hi All,
I have two data sets with different time stamp spacing. I would like to 
visualize an attribute from each data set at the same time step. I would 
like to achieve this by applying TemporalInterpolator first to gain data 
at the desired time step, then applying AppendAttributes to both 
TemporalInterpolator's, i.e.:
root
+ data set 1 ->TemporalInterpolator 1 -> AppendAttributes
+ data set 1 ->TemporalInterpolator 2 -> AppendAttributes
+ AppendAttributes

However, whenever I attached TemporalInterpolator, AppendAttributes 
filter option is gone. Did I do something wrong? Please advise.
Thanks a lot.

Best,
x