Why is IMAQ FPGA Sync Block not available in FlexRIO 7935R

Hello:

I was trying to using  IMAQ FPGA GrayMorphology Erosion function processing a frame, and then I will add the processed frame to the raw frame.

So here comes a problem, for older device like 1473R, I can use FPGA sync block to hold the raw frame, then add the processed frame.

But in the FlexRIO 7935, I can see this function, also I can drop this VI to BD, but after drop the Express VI, the VI simply don't  allow me to open the Express VI front panel, is that a bug or something?

Thanks!