JButton text not appearing

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Java

Swing

Hello,

I am trying to add a JButton to an old desktop application I made using Netbeans.
I want this button to show some caption, so I added it in the properties of the object, using the properties window of the jbutton on the Netbeans IDE , property "text".
No matter what I do, resize the button , alter properties or whatever,the caption doesn't appear.
Can anyone explain me what could be a possible reason ?
And can anyone explain me why other jbuttons also with text properties defined in the IDE correcly show their captions?
Thank you