xml to another xml? (1 Viewer)

[Zarra]

Hallo
I m new hier and i m writing a Plugin , i need please your Help when i m in a xml page and i like to go to another xml page. i have trying with using this follow Methods

GUIWindowManager.ActivateWindow(8110000);
Load(GUIGraphicsContext.Skin + @"\Oberflaeche2.xml");

but i become a Black page

Have you any idea, i m very thankfull for evry help

thanks