Back color not saved

I used a JGoArea having a JGoRectangle similar to the LIstArea class. When i try to change the brush of the Rectangle ans save the file, it’s not opened again !!! Only an empty document is opened, without any exeptions thrown.
do you have any idea why is that happening

I have no idea of how you are persisting your data. Is the needed information actually stored? Or is there a problem when loading?