UIMap Toolbox allows you to restructure your UIMaps, e.g. 
 Open en existing UIMap from context menu in Visual Studio: 
 UIMap Toolbox with two open UIMaps: 
  | 
UIMap Toolbox allows you to restructure your UIMaps, e.g. 
 Open en existing UIMap from context menu in Visual Studio: 
 UIMap Toolbox with two open UIMaps: 
  |