jQuery Grid Plugin - jqGrid

W/O A custom toolbar item the javascript generated is this (ignore quotes):

... "jQuery('#Grid').getGridParam('searchDialogOptions') );"

When A custom toolbar item is added to the controller:

ordersGrid.ToolBarSettings.Add(new JQGridToolBarButton
{
   Text = "",
   ToolTip = "Action",
   ButtonIcon = "ui-icon-image",
   Position = ToolBarButtonPosition.Last,
   OnClick = "customButtonClicked"
};

Result (ignore opening and ending quotes):

... "jQuery('#Grid').getGridParam('searchDialogOptions') );.navButtonAdd('#Grid_pager',{"buttonicon":"ui-icon-image","title":"Add Folder Action","caption":" ","position":"last",onClickButton:function() { customButtonClicked();" ...

The problem appears to be the  ';' (HIGHLIGHTED IN RED)  where the .navButtonAdd begins is not being removed so the commands can be linked. I've tried this with both 1.4.4 & 1.5.2, using jqGrid 4.0.