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Sorting Problem with Grouping

I am using serverside pagination and not using sorting...
I am sorting by PHP code while creating XML.. and it work fines.
so when i am loading grid with
mygrid.groupBy(2);
so 1st time its load the page 1 ... its fine... when load page 2 ... thats also fine...
when you are coming back to page 1... grouping is lost... but i have used...
again groupBy(2) with event "onPageChanged"; .. so its working fine...
but the sorting is not fine... and if you go to page 2 ... there same problem... data is fine...
grouping is fine... but sorting is not fine... the sorting order is changed within the group...
so i am forcing it for sort by grid.sortRows from start but its not working ...

my code is somehow like this...

mygrid.enableCollSpan(true);
mygrid.attachEvent("onPageChanged",function(){ mygrid.groupBy(2); });
/* coz grouping is lost while you come back to page that is already loaded from the server*/
mygrid.init();
mygrid.groupBy(2);
mygrid.sortRows(2,"str","des");
mygrid.loadXML("url",function(){});

and its not even working

mygrid.loadXML("url",function(){
mygrid.sortRows(2,"str","des");
});

groupBy mode not compatible with paging or smart-rendering - combination of those modes are reason of problems in your case.