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Ok thanks. I have just tried the same thing with a JFrame instead of JInternalFrame and it worked. I will look into the JDialog you have mentioned though.

Thanks to you both.

I haven't manually added any code to add the ConfigFrame object to a Container. I thought that I just had to create a New Instance of the ConfigFrame object and call the .SetVisible method to see it....

I have a "MainFrame" which extends a JFrame and in there I have a variety of diferent components. Some of which is a Menu Bar with three Menu Items. I have an ActionEvent on clicking the 'Config'...