What must be returned after custom grid updated?

Hello,

I have a custom data grid, I mean that grid generates in my script manually and with no connector using. I use dataprocessor like this:

descrGridDP = new dataProcessor(“descr.php”);
descrGridDP.setTransactionMode(“POST”, true);
descrGridDP.setUpdateMode(“off”);
descrGridDP.init(descrGrid);

and have a button for grid data saving with action: descrGridDP.sendData();

When the button pressed, data grid successfully stores in database but script returns nothing and there is alert occurs:
Error type: LoadXML
Description: Incorrect XML

Please advise what shoud I return when grid updated successfully or not.

Thank you.
Regards,
Alex.

<data> <action type="some" sid="some" tid="some" /> </data>

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