Creating an application without a template
- Select Mashup > Tools > Mashup Designer. You will be on a blank Designer canvas.
 - From the File menu, select New > New XAML.
 - Specify a location and name to the .xaml file. For ease in locating the application later, it is a good idea to use a name that describes the task the application performs.
 - 
        If you are presented with a dialog box prompting you to associate the new
            .xaml file with the current project, click Yes or No
          depending on your preference. You can assign or re-assign .xaml files
          with projects at any time.
        
You will be on the Designer canvas and can begin adding controls to your application.