Bug 183900 Image in preview pane will not show until you reopen the "Edit Image Item" dialogue [0001]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
/**
 * Dialog to build the image element.
 */
public class ImageBuilder extends BaseDialog
{
	private static final String[] IMAGE_TYPES = new String[]{
			".bmp",
			".jpg",
			".jpeg",
			".jpe",
			".jfif",
			".gif",
			".png",
			".tif",
			".tiff",
			".ico",
			".svg"
	};
	private static final String[] IMAGE_FILEFILTERS = new String[]{
		"*.bmp;*.jpg;*.jpeg;*.jpe;*.jfif;*.gif;*.png;*.tif;*.tiff;*.ico;*.svg"