private Component buildButtonPanel() {
		JPanel panel = new JPanel(new VerticalLayout(10));
		panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 0, 0));
		JButton addFilterButton = new EmptyBorderButton(Icons.ADD_ICON);
		addFilterButton.setToolTipText("Add filter");
		addFilterButton.setName("Add Filter");
		addFilterButton.addActionListener(e -> addFilterWidget());
		panel.add(addFilterButton);
		return panel;
	}
Returns true the panel has only valid filters. (Blank filter is ok)
@return true the panel has only valid filters
Ghidra/Features/BSim/src/main/java/ghidra/features/bsim/gui/search/dialog/BSimFilterPanel.java