public void setLeadingComponent( Component leadingComponent ) {
		putClientProperty( TABBED_PANE_LEADING_COMPONENT, leadingComponent );
	}
Specifies a component that will be placed at the leading edge of the tabs area.
<p>
For top and bottom tab placement, the layed out component size will be
the preferred component width and the tab area height.<br>
For left and right tab placement, the layed out component size will be
the tab area width and the preferred component height.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatTabbedPane.java