From f58adf202f2e37ad3c38b668a7305388b36a35fc Mon Sep 17 00:00:00 2001
From: radoslav-radev <radoslav.radev.85@gmail.com>
Date: Tue, 26 Jan 2016 16:28:26 +0200
Subject: [PATCH 1/3] Add PlacementMode Center in Popup.

---
 src/Perspex.Controls/PlacementMode.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Perspex.Controls/PlacementMode.cs b/src/Perspex.Controls/PlacementMode.cs
index a0ca30e9ad..321f8afa47 100644
--- a/src/Perspex.Controls/PlacementMode.cs
+++ b/src/Perspex.Controls/PlacementMode.cs
@@ -24,5 +24,10 @@ namespace Perspex.Controls
         /// The popup is placed at the top right of its target.
         /// </summary>
         Right,
+
+        /// <summary>
+        /// The popup is placed at the center of its target.
+        /// </summary>
+        Center
     }
 }

From 4ec289479b2046a53938750c41eddd5b25e1705b Mon Sep 17 00:00:00 2001
From: radoslav-radev <radoslav.radev.85@gmail.com>
Date: Fri, 12 Feb 2016 16:59:05 +0200
Subject: [PATCH 2/3] Add Popup PlacementMode Center: measure popup child
 according to placement target instead of popup root.

---
 src/Perspex.Controls/Primitives/Popup.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/Perspex.Controls/Primitives/Popup.cs b/src/Perspex.Controls/Primitives/Popup.cs
index ffa739dd70..2caa129bdc 100644
--- a/src/Perspex.Controls/Primitives/Popup.cs
+++ b/src/Perspex.Controls/Primitives/Popup.cs
@@ -270,7 +270,7 @@ namespace Perspex.Controls.Primitives
         /// Gets the position for the popup based on the placement properties.
         /// </summary>
         /// <returns>The popup's position in screen coordinates.</returns>
-        private Point GetPosition()
+        protected virtual Point GetPosition()
         {
             var zero = default(Point);
             var target = PlacementTarget ?? this.GetVisualParent<Control>();
@@ -283,6 +283,17 @@ namespace Perspex.Controls.Primitives
                     return target?.PointToScreen(new Point(0, target.Bounds.Height)) ?? zero;
                 case PlacementMode.Right:
                     return target?.PointToScreen(new Point(target.Bounds.Width, 0)) ?? zero;
+                case PlacementMode.Center:
+                    if ((target == null) || (Child == null))
+                    {
+                        return zero;
+                    }
+                    else
+                    {
+                        Child.Measure(target.Bounds.Size);
+
+                        return target.PointToScreen(new Point((target.Bounds.Width - Child.DesiredSize.Width) / 2, (target.Bounds.Height - Child.DesiredSize.Height) / 2));
+                    }
                 default:
                     throw new InvalidOperationException("Invalid value for Popup.PlacementMode");
             }

From b3a26498cbe4e25706f1531b6ca20e923485fbdb Mon Sep 17 00:00:00 2001
From: radoslav-radev <radoslav.radev.85@gmail.com>
Date: Tue, 23 Feb 2016 16:32:25 +0200
Subject: [PATCH 3/3] Mame Popup GetPosition() method virtual.

---
 src/Perspex.Controls/PlacementMode.cs    |  9 ++-------
 src/Perspex.Controls/Primitives/Popup.cs | 20 ++++++--------------
 2 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/src/Perspex.Controls/PlacementMode.cs b/src/Perspex.Controls/PlacementMode.cs
index 321f8afa47..ac366a26ec 100644
--- a/src/Perspex.Controls/PlacementMode.cs
+++ b/src/Perspex.Controls/PlacementMode.cs
@@ -23,11 +23,6 @@ namespace Perspex.Controls
         /// <summary>
         /// The popup is placed at the top right of its target.
         /// </summary>
-        Right,
-
-        /// <summary>
-        /// The popup is placed at the center of its target.
-        /// </summary>
-        Center
+        Right
     }
-}
+}
\ No newline at end of file
diff --git a/src/Perspex.Controls/Primitives/Popup.cs b/src/Perspex.Controls/Primitives/Popup.cs
index 2caa129bdc..db3f097f0f 100644
--- a/src/Perspex.Controls/Primitives/Popup.cs
+++ b/src/Perspex.Controls/Primitives/Popup.cs
@@ -2,13 +2,13 @@
 // Licensed under the MIT license. See licence.md file in the project root for full license information.
 
 using System;
+using System.Linq;
 using Perspex.Input;
 using Perspex.Interactivity;
+using Perspex.LogicalTree;
 using Perspex.Metadata;
 using Perspex.Rendering;
 using Perspex.VisualTree;
-using Perspex.LogicalTree;
-using System.Linq;
 
 namespace Perspex.Controls.Primitives
 {
@@ -279,21 +279,13 @@ namespace Perspex.Controls.Primitives
             {
                 case PlacementMode.Pointer:
                     return MouseDevice.Instance.Position;
+
                 case PlacementMode.Bottom:
                     return target?.PointToScreen(new Point(0, target.Bounds.Height)) ?? zero;
+
                 case PlacementMode.Right:
                     return target?.PointToScreen(new Point(target.Bounds.Width, 0)) ?? zero;
-                case PlacementMode.Center:
-                    if ((target == null) || (Child == null))
-                    {
-                        return zero;
-                    }
-                    else
-                    {
-                        Child.Measure(target.Bounds.Size);
-
-                        return target.PointToScreen(new Point((target.Bounds.Width - Child.DesiredSize.Width) / 2, (target.Bounds.Height - Child.DesiredSize.Height) / 2));
-                    }
+
                 default:
                     throw new InvalidOperationException("Invalid value for Popup.PlacementMode");
             }
@@ -321,4 +313,4 @@ namespace Perspex.Controls.Primitives
             }
         }
     }
-}
+}
\ No newline at end of file