protected void updateButtonsVisibility() {
		iconButton.setVisible( frame.isIconifiable() );
		maxButton.setVisible( frame.isMaximizable() );
		closeButton.setVisible( frame.isClosable() );
	}
Provides the Flat LaF internal frame title bar.

@author Karl Tauber
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatInternalFrameTitlePane.java