[NUI] Set AlertDialog's LinearLayout center aligned

To show AlertDialog's Content at the center of AlertDialog,
AlertDialog's LinearLayout is center aligned.

diff --git a/src/Tizen.NUI.Components/Controls/AlertDialog.cs b/src/Tizen.NUI.Components/Controls/AlertDialog.cs
index 3b9ce22..e505d4f 100755 (executable)
--- a/src/Tizen.NUI.Components/Controls/AlertDialog.cs
+++ b/src/Tizen.NUI.Components/Controls/AlertDialog.cs
@@ -481,6 +481,7 @@ namespace Tizen.NUI.Components
             Layout = new LinearLayout()
             {
                 LinearOrientation = LinearLayout.Orientation.Vertical,
+                LinearAlignment = LinearLayout.Alignment.CenterHorizontal,
             };
 
             this.Relayout += OnRelayout;