Thank you for your suggested solutions. Unfortunately, I could not get them to work for me.
First, I tried right-clicking on the Rainlendar window. In the available options, I chose "Windows". Then, I was only presented with a choice of calendar windows to display, "Dual Calendar", "Year View", or "Month View". There were few other choices, too, but none of them said anything about task list.
Then, I tried your other suggestion. However, that also did not work for me. I think it may be because I'm not using the Shadow4 skin.