jQuery Grid Plugin - jqGrid

Hi,

I have two questions about the "grid as a sub-grid" feature:

1) If the sub-grid has no rows for a specifc record in the main grid, it will still display the column headers of the sub-grid. Is there a way of hiding the column headers if the sub-grid is empty?

2) I want to be able to dynamically set the subGrid property of my grid. But if I do that, the alignment and formatting of my grid goes off. Here's an extract of my code:

*--------------------------------*

if (document.getElementById("chkShow History").checked)

{

   $("#tblReport").setGridParam({subGrid:true});

   $("#tblReport").setGridParam({url:............}).trigger("reloadGrid");

}

else

{

   $("#tblReport").setGridParam({subGrid:false});

   $("#tblReport").setGridParam({url:............}).trigger("reloadGrid");

}

*--------------------------------*

Thanks!