[NUI] update scollbar : fix build error.

diff --git a/src/Tizen.NUI.Components/Controls/Scrollbar.cs b/src/Tizen.NUI.Components/Controls/Scrollbar.cs
index a6cc1e7..de3579c 100755 (executable)
--- a/src/Tizen.NUI.Components/Controls/Scrollbar.cs
+++ b/src/Tizen.NUI.Components/Controls/Scrollbar.cs
@@ -530,7 +530,7 @@ namespace Tizen.NUI.Components
         private void UpdateThumbColor(Color color)
         {
             thumbColor = color;
-            if (thumbView.ResourceUrl != string.IsNullOrEmpty)
+            if (String.IsNullOrEmpty(thumbView.ResourceUrl))
             {
                 thumbView.Color = color;
                 thumbView.BackgroundColor = Color.Transparent;