Avoiding key ENTER to "click" OK Button

I have a JDialog with a Canvas inside. I have to handle the keyboard event generated when user presses ENTER in order to write somethig in the Canvas. My event listener is able to handle it. The problem is that the dialog's OK button receives the event too and the dialog is closed as if the user has clicked on it.
What could I do?

Thank you guys, but your solutions have not worked.
When the user presses ENTER, the OK Button is "clicked" even when it doesn't have the focus. JOptionPane creates this button as the "active" one and I don't know how to avoid this behavior.
I've already tried this:
pane = new JOptionPane(...);
JRootPane root = pane.getRootPane();
root.setDefaultButton(null);
It hasn't worked ... NullPointerException in that third line.
And when I tried to getRootPane after creating the Dialog, the setDefaultButton(null) had no effect.
Any other ideas?

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Hi . I have another question to be asked.
Oracle Forms 6i.
I have a form in which DEFAULT&SMARTBAR is the menu and there are no push buttons.
In the form, there is a 'field' named as 'ID No'. After entering 'ID No' in the field and click on 'Execute Query' button from the 'DEFAULT&SMARTBAR' menu, all the details of that respective 'ID No' gets displayed in all the other fields. Even if i press 'F8' all the fields gets displayed with the values.
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