Specifies the location of the style sheet that will be used by the editable area. Multiple Style Sheets are supported. Example ContentCss="example.css,~/portal.css,/default.css"
Example
<?php
$rte=new RichTextEditor();
$rte->Text="Type here";
$rte->ContentCss="example.css,/default.css";
$rte->ID="Editor1";
$rte->MvcInit();
echo $rte->GetString();
// use $_POST["Editor1"]to retrieve the data
?>