I get errors in IE8 like "An error occurred: 'null' is empty or no object" or "'this.viewNode' is empty or no object" when using a tag. Seetest100427buttons.zip for both examples.
Further there is a small problem in IE8 and the header, the name appears in white,while in firefox it is in "black":
No need to tell in Firefox it works
For best results, use the Firefox browser..