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Call object from specific tab

 
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I have a JTabbedPane that creates a new tab every time a button is pressed. It then populates the tab with an object containing a few buttons and a text area.

However I also have an 'Open' button that opens a text file and fills the text area with the file.

My problem is, only the newly created tab is addressed. How can I call methods on objects inside a specific tab?
 
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