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
imageRect = imageRect.intersection( imageBound );
			Rectangle destRect = TransformUtil.transformRect( transform,
					imageRect );
			if ( screenImage != null )
				screenImage.dispose( );
			screenImage = new Image( getDisplay( ),
					clientRect.width,
					clientRect.height );
			GC newGC = new GC( screenImage );
			newGC.setClipping( clientRect );
			newGC.drawImage( sourceImage,
					imageRect.x,
					imageRect.y,
					imageRect.width,
					imageRect.height,
					destRect.x,
					destRect.y,
					destRect.width,
					destRect.height );
			newGC.dispose( );
			gc.drawImage( screenImage, 0, 0 );
		}
		else
		{
			gc.setClipping( clientRect );
			gc.fillRectangle( clientRect );
			initScrollBars( );
		}
	}
	private void initScrollBars( )