gwt2 - GWT's CellTable loading bar won't display while refreshing contents -

I do the following:

Create celltel (displays loading times)
Enter data in it (loading times disappears, data shows)
Now I want to:
1. Clear data and Show loading times
2. Enter more data in it (loading times disappears, data appears)
  Has anyone done this? I have tried some methods, but they look like hacks and have not worked.
  
  There is a case for your case in the GWT trunk, which unfortunately, in the latest GWT -2.2 release Was not included:
  log message
  Adding a loadingstate event for cell load and celltel so that when user data is loaded Can get an event. Now loadingstate is a first class citizen (an interface so that users can define their loading position). Both the cellists and cellTables now support a custom loading pointer widget and a custom widget set to display when the table is empty.
  
  03:22

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