Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebControls/LayoutTableCell.cs

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+//------------------------------------------------------------------------------
+// <copyright file="LayoutTableCell.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System.Security.Permissions;
+    using System.Web;
+
+    /// <devdoc>
+    /// Table cell used for laying out controls in a Render method.  Doesn't parent added controls, so
+    /// it is safe to add child controls to this table.  Sets page of added controls if not already set.
+    /// Used by LayoutTable.  Top-level class instead of private so LayoutTableCells can be added dynamically
+    /// to LayoutTable.
+    /// </devdoc>
+    internal sealed class LayoutTableCell : TableCell {
+
+        protected internal override void AddedControl(Control control, int index) {
+            if (control.Page == null) {
+                control.Page = Page;
+            }
+        }
+
+        protected internal override void RemovedControl(Control control) {
+        }
+    }
+}
+