that line needs to be added.
look for:
$CKEditor->editor("ContentValue", $CKEditor_initialValue, $CKEditor_config);
and change it to:
$CKEditor_config["stylesCombo_stylesSet"] = "my_styles:style_lists/stylelist1.js";
$CKEditor->editor("ContentValue", $CKEditor_initialValue, $CKEditor_config);