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Try doing some debugging. Remove/comment out adding the tabbed pane and only add the Thing object.
Change the values of the sizes and locations used to position the components until the Thing...

What is supposed to happen when the code is executed? I get a small frame in upper left with 3 tabs? jammed into a vertical alignment. Where is the problem?

Please post the code for a small complete program that compiles, executes and shows the problem.

Please make a small complete program that compiles, executes and shows the problem.