Waiting for new data to load before showing group

[homeschoolmoment]

I have an app with a listing of things. There is a hidden group which is displayed when a listing is clicked. The group contains text and images that are loaded from the thing that was clicked. Each time a new listing is clicked, it displays the group, then there is a delay when it still shows the old thing data before it loads the new thing’s data. Is there a way to wait for it to load the new data before it is shown? Thanks!