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
{
			textGd.widthHint = 270;
			textGd.grabExcessHorizontalSpace = true;
		}
		uriEditor.setLayoutData( textGd );
		uriEditor.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}
		} );
		initURIEditor( );
	}
	private void buildEmbeddedImageList( )
	{
		embeddedImageList = new List( inputArea, SWT.NONE
				| SWT.SINGLE
				| SWT.BORDER
				| SWT.V_SCROLL
				| SWT.H_SCROLL );
		embeddedImageList.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		embeddedImageList.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent event )
			{
				preview( );
				updateButtons( );
			}
		} );
		initList( );
	}