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
*/
	public Image loadImage( URL url )
	{
		if ( sourceImage != null && !sourceImage.isDisposed( ) )
		{
			sourceImage.dispose( );
			sourceImage = null;
		}
		sourceImage = ImageDescriptor.createFromURL( url ).createImage( );
		if ( sourceImage.getBounds( ).width > this.getBounds( ).width
				|| sourceImage.getBounds( ).height > this.getBounds( ).height )
		{
			fitCanvas( );
		}
		else
		{
			showOriginal( );
		}
		return sourceImage;
	}
	/**
	 * Reset the image data and update the image.
	 * 
	 * @param data
	 */
	public void setImageData( ImageData data )
	{
		if ( sourceImage != null )
		{
			sourceImage.dispose( );