Thanks for your quick reply,

sorry I must be missing something in the documentation but:-

I register a new button with the control

and add the onclick attribute to be

myNewImage.Attributes.Add("onclick", "_Format('myRichTextBox','blockquotes');")

then in the _Format javascript function I am adding a new case/switch

case "blockquotes":

editor.document.execCommand('FormatBlock', true, '<blockquote>');

break;

but nothing happens when I click it

am I doing something stupid ?

regards

marc