It is a common practice to have those lines display only on the top staff of the piano.

If you want them on all staves :

1) Staff Tool :  make sure the in the staff attributes of each staff, Endings and Repeats is selected to display (Both staves of the piano). Then : 

2) Repeat tool.

Double click on the handle that is associated with the number (hidden). Select Edit Ending, Select All.

I'm sorry it seems you misunderstood me. I wasn't referring to the measure brackets for the first and second ending. My problem is getting the barline with the two dots to show on both staves. It simply refuses. I could get the measure brackets for the first and second ending to show on just the top staff if Top Staff only was selected, but I can't get the double bar repeat symbol to show on both staves of the piano part.

BTW, I have a couple of repeats in this song and all of them are similarly afflicted. This is what leads me to believe it's a global setting. But editing the staff attributes to include endings and text repeats didn't do the job.

The culprit could be in the Staff Tool.

Make sure that the option {Repeat Bars} is selected (not de-selected):

I see, you ment barlines. In the staff attributes, Repeat Bars should be checked for both staves. Is it the case ?

If the piano was created as a group (Wizzard or Score Manager -> New Instrument), the repeat barlines should be present from the start.

Thank you!! That did it. Yee Haw!

If I may ask one more question. In another song I have a DC al coda and in the next bar the coda starts. I can't find a way to get even a double barline between the two. Suggestion?

FYI, I fixed the other song by editing measure attributes and giving it a double barline. Thanks again.