Layouts: The Tab key can send the cursor anywhere

Whatis Focus / What do ut do ?

Google:
Focus means you have selected the particular GUI element.

I don’t get the use to set the focus to a Label, PopupMenu, etc.

I do not get the use of a Container that tooks the whole window size that holds all controls.
Oh, yes, I know: you like verbose programming:
You need to write (If I understand Container):
Container1.TextArea1.Text = "I love typing text on my keyboard"
instead of:
TextArea1.Text = "I love typing text on my keyboard"

Also:
I do not get the need to make a bug quest: at least, you will find some bug. Will it impact your developent ? I do not know? but remember: “who search will find”

You want:
change the Label Contents whent it got the Focus ?
execute an action when it gor the Focus ?

Explain, in another thread, this one is marked as Solution is set to True, whay you want to do in your software that needs to ser the Focus on these Controls…