Dynamically changing ListGrid empty message

Hi,

We are using GWT-RPC for fetching data (i know you dont recommend it, but we have to for some legacy apis). When making the RPC call, I want to change the empty message to "Loading ..." and if I get no response/error back I want to change the empty message accordingly.

When I use set listGrid.setEmptyMessage, the listgrid sometimes displays only loading message and does not change to error/empty message when the response is returned as empty/error.

Any advice on know how to get this to work correctly?