Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/UI/BuilderPropertyEntry.cs

@@ -0,0 +1,31 @@
+//------------------------------------------------------------------------------
+// <copyright file="BuilderPropertyEntry.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    /// <devdoc>
+    /// Abstract base class for all property entries that require a ControlBuilder
+    /// </devdoc>
+    public abstract class BuilderPropertyEntry : PropertyEntry {
+        private ControlBuilder _builder;
+
+        internal BuilderPropertyEntry() {
+        }
+
+
+        /// <devdoc>
+        /// </devdoc>
+        public ControlBuilder Builder {
+            get {
+                return _builder;
+            }
+            set {
+                _builder = value;
+            }
+        }
+    }
+}
+
+