Using the Canvas layout panel
A Canvas layout panel is the simplest layout panel in Microsoft Expression Blend. It supports absolute positioning and does not apply any layout policy to its child objects—it is a blank canvas. Use a Canvas layout panel when fixed positioning is paramount. Objects that you place in a Canvas layout panel will not automatically resize when you resize your application as they can with a Grid layout panel.
Add a Canvas layout panel to a document by using the Assets panel or the layout container button in the Tools panel.