Try this file: RemiCustomAddon_Baertram
Added comments and examples, hope it helps you to understand it.
The 2 TLCs are just a container here and the labels are the controls that should be moved. So you need 2 TLCs as described above or one that is as big as your screen.
You maybe could even strip the TLCs and simply add the controls + their labels to the GUI.
Hope you understand all.