public void showFilterButton() {

		if (isVisible()) {
			return;
		}

		this.transparency = FULLY_TRANSPARENT;
		setVisible(true);

		reanimate();
	}
A label that displays an icon that, when clicked, will clear the contents of the 
associated filter.
Ghidra/Framework/Docking/src/main/java/docking/widgets/filter/ClearFilterLabel.java