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
double select = -scrollBar.getSelection( );
		af.preConcatenate( AffineTransform.getTranslateInstance( select - tx, 0 ) );
		transform = af;
		syncScrollBars( );
	}
	private void scrollVertically( ScrollBar scrollBar )
	{
		if ( sourceImage == null )
			return;
		AffineTransform af = transform;
		double ty = af.getTranslateY( );
		double select = -scrollBar.getSelection( );
		af.preConcatenate( AffineTransform.getTranslateInstance( 0, select - ty ) );
		transform = af;
		syncScrollBars( );
	}
	/**
	 * Returns the Source image.
	 * 
	 * @return sourceImage.
	 */
	public Image getSourceImage( )
	{
		return sourceImage;
	}
	/**
	 * SYNC the scroll-bars with the image.
	 */
	public void syncScrollBars( )
	{