Create temporary context - PIER

Hi all, I would like to create a Widget for PIER which will generate a HTML page by using the tree structure of PIER with a visitor. Currently I have created a test by creating a visitor who overloads PRViewRenderer (PIER -SEASIDE). Unfortunately I encounter a problem of context when I launch my app. Can you help me to understand how to create a temporary context? Sample of my code: kernel := PRKernel instances anyOne. myVisitor := SPGHTMLVisitor new. myVisitor renderer: WAStaticHtmlCanvas new. page := kernel root. PRCurrentContext use: (PRContext kernel: kernel) during: [myVisitor start: page.]. Thanks in advance Pe