diff --git a/OpenRa.Game/Region.cs b/OpenRa.Game/Region.cs
index 4b32a04f22..683fb0f18a 100644
--- a/OpenRa.Game/Region.cs
+++ b/OpenRa.Game/Region.cs
@@ -12,7 +12,47 @@ namespace OpenRa.Game
 		Size size;
 		MethodInvoker drawFunction;
 
-		public Region(Point location, Size size, MethodInvoker drawFunction)
+		static Size MakeSize(Viewport v, DockStyle d, int size)
+		{
+			switch (d)
+			{
+				case DockStyle.Top:
+				case DockStyle.Bottom:
+					return new Size(v.Width, size);
+
+				case DockStyle.Left:
+				case DockStyle.Right:
+					return new Size(size, v.Height);
+
+				default:
+					throw new NotImplementedException();
+			}
+		}
+
+		public static Region Create(Viewport v, DockStyle d, int size, MethodInvoker f)
+		{
+			Point topLeft = new Point(0, 0);
+			Point bottomRight = new Point(v.ClientSize);
+
+			Size s = MakeSize(v, d, size);
+
+			switch (d)
+			{
+				case DockStyle.Top:
+				case DockStyle.Left:
+					return new Region(topLeft, s, f);
+
+				case DockStyle.Right:
+				case DockStyle.Bottom:
+					Point origin = bottomRight; origin.Offset( -s.Width, -s.Height );
+					return new Region(origin, s, f);
+
+				default:
+					throw new NotImplementedException();
+			}
+		}
+
+		Region(Point location, Size size, MethodInvoker drawFunction)
 		{
 			this.location = location;
 			this.size = size;
diff --git a/OpenRa.Game/Sidebar.cs b/OpenRa.Game/Sidebar.cs
index e10a6b50b5..0ee8d6bb71 100644
--- a/OpenRa.Game/Sidebar.cs
+++ b/OpenRa.Game/Sidebar.cs
@@ -25,7 +25,7 @@ namespace OpenRa.Game
 		public Sidebar(Race race, Renderer renderer, Viewport viewport)
 		{
 			this.viewport = viewport;
-			viewport.RequestRegion(AnchorStyles.Right, 128, Paint);
+			viewport.AddRegion( Region.Create(viewport, DockStyle.Right, 128, Paint));
 			techTree.CurrentRace = race;
 			techTree.Build("FACT", true);
 			spriteRenderer = new SpriteRenderer(renderer, false);
diff --git a/OpenRa.Game/TerrainRenderer.cs b/OpenRa.Game/TerrainRenderer.cs
index d18946bf5a..7a77d8cafd 100644
--- a/OpenRa.Game/TerrainRenderer.cs
+++ b/OpenRa.Game/TerrainRenderer.cs
@@ -24,7 +24,7 @@ namespace OpenRa.Game
 		{
 			this.renderer = renderer;
 			this.viewport = viewport;
-			viewport.RequestRegion(AnchorStyles.Left, viewport.ClientSize.Width - 128, Draw);
+			viewport.AddRegion(Region.Create(viewport, DockStyle.Left, viewport.ClientSize.Width - 128, Draw));
 			this.map = map;
 
 			tileSet = new TileSet(tilePackage, map.TileSuffix);
diff --git a/OpenRa.Game/Viewport.cs b/OpenRa.Game/Viewport.cs
index 3b0730cc79..768df0c77b 100644
--- a/OpenRa.Game/Viewport.cs
+++ b/OpenRa.Game/Viewport.cs
@@ -19,6 +19,9 @@ namespace OpenRa.Game
 		public float2 Location { get { return scrollPosition; } }
 		public float2 Size { get { return new float2(ClientSize); } }
 
+		public int Width { get { return clientSize.Width; } }
+		public int Height { get { return clientSize.Height; } }
+
 		public void Scroll(float2 delta)
 		{
 			scrollPosition = (scrollPosition + delta).Constrain(
@@ -33,25 +36,9 @@ namespace OpenRa.Game
 		}
 
 		List<Region> regions = new List<Region>();
-		public void RequestRegion(AnchorStyles anchor, int distanceFromAnchor, MethodInvoker drawFunction)
+		public void AddRegion(Region r)
 		{
-			switch (anchor)
-			{
-				case AnchorStyles.Top:
-					regions.Add(new Region(new Point(0, 0), new Size(clientSize.Width, distanceFromAnchor), drawFunction));
-					break;
-				case AnchorStyles.Bottom:
-					regions.Add(new Region(new Point(0, clientSize.Height - distanceFromAnchor), new Size(clientSize.Width, distanceFromAnchor), drawFunction));
-					break;
-				case AnchorStyles.Left:
-					regions.Add(new Region(new Point(0, 0), new Size(distanceFromAnchor, clientSize.Height), drawFunction));
-					break;
-				case AnchorStyles.Right:
-					regions.Add(new Region(new Point(clientSize.Width - distanceFromAnchor, 0), new Size(distanceFromAnchor, clientSize.Height), drawFunction));
-					break;
-				case AnchorStyles.None:
-					throw new NotImplementedException();
-			}
+			regions.Add(r);
 		}
 
 		public void DrawRegions()
diff --git a/OpenRa.Game/World.cs b/OpenRa.Game/World.cs
index 4c26ae4108..31ceff7a46 100644
--- a/OpenRa.Game/World.cs
+++ b/OpenRa.Game/World.cs
@@ -19,7 +19,7 @@ namespace OpenRa.Game
 		{
 			this.renderer = renderer;
 			this.viewport = viewport;
-			viewport.RequestRegion(AnchorStyles.Left, viewport.ClientSize.Width - 128, Draw);
+			viewport.AddRegion(Region.Create(viewport, DockStyle.Left, viewport.ClientSize.Width - 128, Draw));
 			spriteRenderer = new SpriteRenderer(renderer, true);
 		}