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/util/graphics/ImageCanvas.java
* 
	 * @param parent
	 */
	public ImageCanvas( final Composite parent )
	{
		this( parent, 0 );
	}
	/**
	 * The constructor.
	 * 
	 * @param parent
	 * @param style
	 *  
	 */
	public ImageCanvas( final Composite parent, int style )
	{
		super( parent, style );
		addControlListener( new ControlAdapter( ) {
			public void controlResized( ControlEvent event )
			{
				syncScrollBars( );
			}
		} );
		addPaintListener( new PaintListener( ) {
			public void paintControl( final PaintEvent event )
			{
				paint( event.gc );
			}
		} );
		initScrollBars( );