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How I can attach userData to an option

How I can attach userData to an option (particular attribute)?

Regards

userData can be used to attach custom attributes for grid all for specified rows, it can't be used for other purposes.


<rows>
    <userdata name="a1">b1</userdata>
    <row id="some">
         <userdata name="some1">some2</userdata>

In this sample userdata "a1" attached to grid itself and can be obtained by
     grid.getUserData("","a1");

userdata "some1" attached only to row "some"
      grid.getUserData("some","some1");