Bug 54595 Load User Libraries dialog has layout problems
Reached through Pref Page Java/Build Path/User Libraries/Load...
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/UserLibraryPreferencePage.java
private final Object[] EMPTY= new Object[0];
		public void customButtonPressed(TreeListDialogField field, int index) {
			doCustomButtonPressed(field, index);
		}
		public void selectionChanged(TreeListDialogField field) {
			doSelectionChanged(field);
		}
		
		public void doubleClicked(TreeListDialogField field) {