UI Button not working as Prefab

Hi,

I have the following issue: I have created a UI 'element' consisting of Panel, containing a Button and 3 Images. The Button itself has a Text, as it is by default. Everything is working great.

However, when I create an empty prefab and drag the Panel there - basically to create a reusable asset - the structure is 'flattened', meaning the Button's label is at the same level as the Button itself. It is still visible, however I noticed, that when the prefab is instantiated, I can only...

UI Button not working as Prefab