public void setTabsClosable( boolean tabClosable ) {
		putClientPropertyBoolean( TABBED_PANE_TAB_CLOSABLE, tabClosable, false );
	}
Specifies whether all tabs are closable.
If set to {@code true}, all tabs in that tabbed pane are closable.
To make individual tabs closable, use {@link #setTabClosable(int, boolean)}.
<p>
Note that you have to specify a callback (see {@link #setTabCloseCallback(BiConsumer)})
that is invoked when the user clicks a tab close button.
The callback is responsible for closing the tab.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatTabbedPane.java