尝试在“图形布局”选项卡中查看我的XML

I've been playing around with XML trying to get buttons lined up by changing the int. values and then seeing how it looks on my phone. I've tried to get the XML to show up on my "Graphical Layout" tab on Eclipse with no success. Do I need to add something to the XML file to get it to display on the "Graphical Layout" tab or is this some kind of settings error on my eclipse?I've been playing around with XML trying to get