<script>
 
    var dhxWins = new dhtmlXWindows();
    ...
    // show stick button
    dhxWins.window(id).button("stick").show();
    // stick
    dhxWins.window(id).stick();
    // unstick
    dhxWins.window(id).unstick();
    // is sticked
    var isSticked = dhxWins.window(id).isSticked(); // true/false</script>