public String getTabCloseToolTipText( int tabIndex ) {
		JComponent c = (JComponent) getComponentAt( tabIndex );
		return (String) c.getClientProperty( TABBED_PANE_TAB_CLOSE_TOOLTIPTEXT );
	}
Returns the tooltip text used for tab close button at the given tab index.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatTabbedPane.java