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
private void buildInputAreaButton( int type )
	{
		if ( type == URI_TYPE )
		{
			inputButton = new Button( inputArea, SWT.PUSH );
			
			setExpressionButtonImage( inputButton );
			inputButton.addSelectionListener( new SelectionAdapter( ) {
				public void widgetSelected( SelectionEvent event )
				{
					openExpression( );
				}
			} );
		}
		else if ( type == FILE_TYPE )
		{
			inputButton = new Button( inputArea, SWT.PUSH );
			inputButton.setText( BUTTON_BROWSE ); 
			inputButton.addSelectionListener( new SelectionAdapter( ) {
				public void widgetSelected( SelectionEvent event )
				{
					openResourceBrowser( );
				}
			} );
		}
		else if ( type == EMBEDDED_TYPE )
		{
			importButton = new Button( inputArea, SWT.PUSH );
			importButton.setText( BUTTON_IMPORT );
			importButton.setLayoutData( new GridData( GridData.VERTICAL_ALIGN_END ) );