Bug 136256 Enhance the message builder
Please see the spec attached in 133995 for detail.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
case EMBEDDED_TYPE :
				complete = ( embeddedImageList.getSelectionCount( ) > 0 );
				
				break;
		}
		getOkButton( ).setEnabled( complete );
	}
	private void openExpression( )
	{
		ExpressionBuilder expressionBuilder = new ExpressionBuilder( uriEditor.getText( ) );
		
		
		
		
		unionDataSets( );
		ExpressionProvider provider = new ExpressionProvider( inputImage );
		expressionBuilder.setExpressionProvier( provider );
		
		if ( expressionBuilder.open( ) == OK )
		{
			uriEditor.setText( expressionBuilder.getResult( ) );
		}
	}
	private void openBidingDialog( )
	{
		CommandStack stack = SessionHandleAdapter.getInstance( )
				.getCommandStack( );
		ReportItemHandle handle = (ReportItemHandle) inputImage;
		stack.startTrans( Messages.getString( "DesignerActionBarContributor.menu.element.editDataBinding" ) ); 
		DataBindingDialog dialog = new DataBindingDialog( PlatformUI.getWorkbench( )