Grid: Using the in-line editor to 'Add' generates some warnings

Hi All,

I ran into the following problem when I tried to use the grid in-line editor. Any help would be most appreciated. 

I use a form with a grid in a modal dialog to capture a master and detail relationship. Here are snippets of my code that use the in-line editor: 
 

class MyFieldGroup extends FieldGroup {
            public MyFieldGroup() {
                super();
                bind(new TextField(), "item");
                bind(new TextField(), "value");
            }
        }       
         ...
        Item item = getConfigChangeGrid().getContainerDataSource().addItem(propertyName);
        ...
        FieldGroup fieldGroup = new MyFieldGroup();
        getConfigChangeGrid().setEditorFieldGroup(fieldGroup);
        getConfigChangeGrid().editItem(propertyName);

After adding a few rows in the grid, on closing the dialog, I get the following WARNINGs:

Oct 13, 2015 8:27:59 AM com.vaadin.ui.ConnectorTracker cleanConnectorMap
WARNING: cleanConnectorMap unregistered connector com.vaadin.ui.TextField(203) (parent: com.e2e.stingray.ui.view.administration.change.NewConfigChangeTable1$ConfigChangeGrid(194)). This should have been done when the connector was detached.
Oct 13, 2015 8:27:59 AM com.vaadin.ui.ConnectorTracker cleanConnectorMap
WARNING: cleanConnectorMap unregistered connector com.vaadin.ui.TextField(204) (parent: com.e2e.stingray.ui.view.administration.change.NewConfigChangeTable1$ConfigChangeGrid(194)). This should have been done when the connector was detached.

Are there cleanups that I am supposed to do?