Bug 72903 Add variable expansion for Test Class in JUnit launch configurations [JUnit]
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/launcher/JUnitMainTab.java
private Label fProjLabel;
	private Text fProjText;
	private Button fProjButton;
	private Button fKeepRunning;
	
	
	private Text fTestText;
	private Button fSearchButton;
	private final Image fTestIcon= createImage("obj16/test.gif"); 
	private String fOriginalTestMethodName;
	private Label fTestMethodLabel;
	private Text fContainerText;
	private IJavaElement fContainerElement;
	private final ILabelProvider fJavaElementLabelProvider= new JavaElementLabelProvider();
	private Button fContainerSearchButton;
	private Button fTestContainerRadioButton;
	private Button fTestRadioButton;
	private Label fTestLabel; 
	
	/**
	 * @see ILaunchConfigurationTab#createControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createControl(Composite parent) {		
		Composite comp = new Composite(parent, SWT.NONE);
		setControl(comp);
		GridLayout topLayout = new GridLayout();
		topLayout.numColumns= 3;