I have created a stackpanel (Dim myPanel as New StackPanel) and placed it inside a Grid with its width set to Auto. I set the width for the panel to: myPanel.Width = 500. Now when running the window in other screens the parent grid displays fine but the panel is much smaller than I want. How do I set the Width for the stackpanel sothat it resizes correctly in every screen. I guess there is no code needed in order to figure out the solution. Thanks for assisting.