private ExpressionSubPanel createExpressionPanel(Class<?> expectedDataType){
  ExpressionSubPanel panel=new ExpressionSubPanel(this,expectedDataType);
  outerPanel.add(panel,ExpressionSubPanel.getPanelName());
  return panel;
}

private ExpressionSubPanel createExpressionPanel ( Class < ? > expectedDataType ) { ExpressionSubPanel panel = new ExpressionSubPanel ( this , expectedDataType ) ; outerPanel . add ( panel , ExpressionSubPanel . getPanelName ( ) ) ; return panel ; }
creates the expression panel .
