Bug 144590 [Accessibility] BIRT custom controls should support active accessibility
Description: BIRT custom controls should support active accessibility. There are some custom controls in BIRT GUI. In Eclipse, when implementing a custom control you should also implement some or all of (as they apply to your control) org.eclipse.swt.accessibility.AccessibleListener, org.eclipse.swt.accessibility.AccessibleControlListener and org.eclipse.swt.accessibility.AccessibleTextListener. Also, the custom control can notify Active Accessibility of changes within the control using org.eclipse.swt.accessibility.Accessible methods such as setFocus(), selectionChanged(), textCaretMoved(), textChanged() and textSelectionChanged().
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/PreviewLabel.java
* Default constructor.
	 * 
	 * @param parent
	 *            widget parent.
	 * @param style
	 *            create style.
	 */
	public PreviewLabel( Composite parent, int style )
	{
		super( parent, style );
		initFields( );
		addPaintListener( new PaintListener( ) {
			public void paintControl( PaintEvent e )
			{
				PreviewLabel.this.paintControl( e );
			}
		} );
		addDisposeListener( new DisposeListener( ) {
			public void widgetDisposed( DisposeEvent e )
			{
				if ( fontCreated )
				{
					getFont( ).dispose( );
				}
			}
		} );
	}
	private void initFields( )
	{
		try