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diff --git a/indra/llui/llviewmodel.cpp b/indra/llui/llviewmodel.cpp
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+/**
+ * @file   llviewmodel.cpp
+ * @author Nat Goodspeed
+ * @date   2008-08-08
+ * @brief  Implementation for llviewmodel.
+ * 
+ * $LicenseInfo:firstyear=2008&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "llviewmodel.h"
+// STL headers
+// std headers
+// external library headers
+// other Linden headers
+
+///
+LLViewModel::LLViewModel()
+ : mDirty(false)
+{
+}
+
+/// Instantiate an LLViewModel with an existing data value
+LLViewModel::LLViewModel(const LLSD& value)
+  : mDirty(false)
+{
+    setValue(value);
+}
+
+/// Update the stored value
+void LLViewModel::setValue(const LLSD& value)
+{
+    mValue = value;
+    mDirty = true;
+}
+
+LLSD LLViewModel::getValue() const
+{
+    return mValue;
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+///
+LLTextViewModel::LLTextViewModel()
+  : LLViewModel(false),
+	mUpdateFromDisplay(false)
+{
+}
+
+/// Instantiate an LLViewModel with an existing data value
+LLTextViewModel::LLTextViewModel(const LLSD& value)
+  : LLViewModel(value),
+	mUpdateFromDisplay(false)
+{
+}
+
+/// Update the stored value
+void LLTextViewModel::setValue(const LLSD& value)
+{
+	LLViewModel::setValue(value);
+    mDisplay = utf8str_to_wstring(value.asString());
+    // mDisplay and mValue agree
+    mUpdateFromDisplay = false;
+}
+
+void LLTextViewModel::setDisplay(const LLWString& value)
+{
+    // This is the strange way to alter the value. Normally we'd setValue()
+    // and do the utf8str_to_wstring() to get the corresponding mDisplay
+    // value. But a text editor might want to edit the display string
+    // directly, then convert back to UTF8 on commit.
+    mDisplay = value;
+    mDirty = true;
+    // Don't immediately convert to UTF8 -- do it lazily -- we expect many
+    // more setDisplay() calls than getValue() calls. Just flag that it needs
+    // doing.
+    mUpdateFromDisplay = true;
+}
+
+LLSD LLTextViewModel::getValue() const
+{
+    // Has anyone called setDisplay() since the last setValue()? If so, have
+    // to convert mDisplay back to UTF8.
+    if (mUpdateFromDisplay)
+    {
+        // The fact that we're lazily updating fields in this object should be
+        // transparent to clients, which is why this method is left
+        // conventionally const. Nor do we particularly want to make these
+        // members mutable. Just cast away constness in this one place.
+        LLTextViewModel* nthis = const_cast<LLTextViewModel*>(this);
+        nthis->mUpdateFromDisplay = false;
+        nthis->mValue = wstring_to_utf8str(mDisplay);
+    }
+    return LLViewModel::getValue();
+}
+
+
+////////////////////////////////////////////////////////////////////////////
+
+LLListViewModel::LLListViewModel(const LLSD& values)
+  : LLViewModel()
+{
+}
+
+void LLListViewModel::addColumn(const LLSD& column, EAddPosition pos)
+{
+}
+
+void LLListViewModel::clearColumns()
+{
+}
+
+void LLListViewModel::setColumnLabel(const std::string& column, const std::string& label)
+{
+}
+
+LLScrollListItem* LLListViewModel::addElement(const LLSD& value, EAddPosition pos,
+                                         void* userdata)
+{
+    return NULL;
+}
+
+LLScrollListItem* LLListViewModel::addSimpleElement(const std::string& value, EAddPosition pos,
+                                               const LLSD& id)
+{
+    return NULL;
+}
+
+void LLListViewModel::clearRows()
+{
+}
+
+void LLListViewModel::sortByColumn(const std::string& name, bool ascending)
+{
+}