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use DataProcessor in Treegrid

How to set _waitMode to 0 in DataProcessor?
When i add/delete the first row in the treegird manually, it's successful;but deal the second row,it's failed.

_waitMode flag used to send next data request only after response on previous received ( it critical for tree and treegrid which uses parent-child relations ) 
The flag set back to 0, as far as valid XML response will be received from the server.

You can try to include dhtmlxdataprocessor_debug.js and check, that server correctly respond on first command.