How to make Questa show delays through gates?

Hello,

In one of my designs, I use extra gates (with 'keep' attribute) to introduce necessary delays through combinational logic. I am fairly certain that complier follows the 'keep' directive, because Timing Analyzer shows these extra delays. However, when I use Questa with the *.vo file generated by Quartus complier, the gate delays are not observable in the Wave view.

How do I make Questa show gate delays?