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The user-defined Datatips at the header can be set by using the dataTipJsFunction attribute in <DataGrid>. Mouse over the header of this sample Grid, then you will find that the user-defined Datatips pops up.

...
<DataGrid ... dataTipJsFunction="dataTip" ... >
...
</DataGrid>
					
function dataTip(item) {
  if (item["getMinWidth"])
    return item.getDataField()+" header";
  else
    return null;
}

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