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Dhtmlxgrid with Grouping

hello team

i have a question regarding grouping and ungrouping the records in dhtmlxgrid. i am using the sample code below
<input name="q1" value="regroup by" onclick='mygrid.OI(document.getElementById("sel").value);' type="button"> <select id="sel"> <option value="0">Sales</option><option value="1">Book title</option><option value="2">Author</option><option value="3">Price</option> <option value="4">In Store</option><option value="5">Shipping</option></select>
<a href="javascript:void(0)" onclick="mygrid.Mg()">expand </a>/<a href="javascript:void(0)" onclick="mygrid.KU()"> colapse</a> all groups<br/>         

where are the functions mygrid.Mg() and mygrid.KU() located. when i use them, firefox reports error saying the KU and Mg functions are invalid. i am using the below js files
<script src="dhtmlx/library/dhtmlxGrid/codebase/dhtmlxcommon.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/codebase/dhtmlxgrid.js"></script>        
    <script src="dhtmlx/library/dhtmlxGrid/codebase/dhtmlxgridcell.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/codebase/dhtmlXGrid_pgn.js"></script>
    <script src="dhtmlx/library/dhtmlxCalendar/codebase/dhtmlxcalendar.js"></script>    
    <script src="dhtmlx/library/dhtmlxGrid/codebase/excells/dhtmlxgrid_excell_dhxcalendar.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/codebase/ext/dhtmlxgrid_filter1.js"></script>
    <script src="dhtmlx/library/dhtmlxDataProcessor/codebase/dhtmlxdataprocessor.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/codebase/ext/dhtmlxgrid_srnd1.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/codebase/excells/dhtmlxgrid_excell_dec1.js"></script>
    <script src="dhtmlx/library/dhtmlxGrid/sources/ext/dhtmlxgrid_group.js" type="text/javascript"></script>
    <script src="dhtmlx/dhtmlxgrid_excell_link.js"></script>
    <script src="dhtmlx/dhtmlxgrid_splt.js"></script>

Please advice

>>mygrid.Mg() and mygrid.KU() located
Please use the js files from the packages, not the compressed versions from online samples. ( they have correct real names of methods , not the compressed abbreviations ) 

please let me know which js file

All files that you mentioned (dhtmlxGrid/codebase/dhtmlxgrid.js and others), but from the official PRO package.