No Pagination when using the JSON loader

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When using the JSON loader in a datagrid, the pagination pager turns up but the parameters are not added to the request.

Using the alternative works fine (url:..., queryParams: {..}, ...etc.)

The loader seemed great because I could store the ajax call in a defered or promis jQuery object, to monitor its state.
Perhaps this is a possible upgrade for datagrid objects?
for example: jQuery('#dg').datagrid('getAjaxState'); ?  // is the content being loaded into the datagrid allready?
or a check if the datagrid allready is initialized and/or contains data?  (important when multiple datagrids depend on each other )

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ehh bump?