[NUI]Change GetWindowList() to static (#956)

diff --git a/src/Tizen.NUI/src/internal/Application.cs b/src/Tizen.NUI/src/internal/Application.cs
index af1f535..ce8479f 100755 (executable)
--- a/src/Tizen.NUI/src/internal/Application.cs
+++ b/src/Tizen.NUI/src/internal/Application.cs
@@ -1354,7 +1354,7 @@ namespace Tizen.NUI
             return ret;
         }
 
-        internal List<Window> GetWindowList()
+        internal static List<Window> GetWindowList()
         {
             uint ListSize = Interop.Application.Application_GetWindowsListSize();
             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();