Bug 18229 Walkback when closing ImageAnalyzer
Build 20020527 Win2k 1. Open the ImageAnalyzer SWT example. 2. Load an animated gif. 3. Hit 'animate' 4. Close the window. 5. Walkback
examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/imageanalyzer/ImageAnalyzer.java
if (image != null) {
					imageCanvas.redraw();
				}
			}
		});
		
		maskCheck = new Button(group, SWT.CHECK);
		maskCheck.setText(bundle.getString("Mask"));
		maskCheck.setSelection(showMask);
		maskCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				showMask = ((Button)event.widget).getSelection();
				if (image != null) {
					imageCanvas.redraw();
				}
			}
		});
		
		backgroundCheck = new Button(group, SWT.CHECK);
		backgroundCheck.setText(bundle.getString("Background"));
		backgroundCheck.setSelection(showBackground);
		backgroundCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				showBackground = ((Button)event.widget).getSelection();
			}
		});
		
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Animation"));