I always have trouble figuring out the height for list_box tiles. It takes too long to get it to show a certain number of lines. And then sometimes nothing seems to work.
Here's a short function with an algorithm to calculate the list_box height values.
It rounds up the lines that are skipped in dcl. i.e. 5 10 15 21 26 31 37 42 47 and 53...
I hope this works for you.