My RadGrid (Version 2012.2.912.40):
<asp:UpdatePanel ID="InterfacePanel" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<telerik:RadGrid ID="InterfaceGrid" BackColor="White" Skin="Vista" AutoGenerateColumns="false" AllowSorting="true" runat="server">
<ClientSettings AllowColumnsReorder="true" ReorderColumnsOnClient="true" ColumnsReorderMethod="Reorder" AllowKeyboardNavigation="True" />
<MasterTableView HierarchyDefaultExpanded="true" EnableColumnsViewState="false" EditMode="InPlace" BorderColor="#ededed" GridLines="Both" CommandItemDisplay="Top" InsertItemDisplay="Bottom">
<HeaderStyle HorizontalAlign="Left" />
<EditFormSettings>
<EditColumn ButtonType="ImageButton" />
</EditFormSettings>
</MasterTableView>
<ValidationSettings EnableValidation="true" CommandsToValidate="PerformInsert,Update" />
<ItemStyle Wrap="false" />
<ActiveItemStyle Wrap="false" />
</telerik:RadGrid>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="InterfacePanel" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<telerik:RadGrid ID="InterfaceGrid" BackColor="White" Skin="Vista" AutoGenerateColumns="false" AllowSorting="true" runat="server">
<ClientSettings AllowColumnsReorder="true" ReorderColumnsOnClient="true" ColumnsReorderMethod="Reorder" AllowKeyboardNavigation="True" />
<MasterTableView HierarchyDefaultExpanded="true" EnableColumnsViewState="false" EditMode="InPlace" BorderColor="#ededed" GridLines="Both" CommandItemDisplay="Top" InsertItemDisplay="Bottom">
<HeaderStyle HorizontalAlign="Left" />
<EditFormSettings>
<EditColumn ButtonType="ImageButton" />
</EditFormSettings>
</MasterTableView>
<ValidationSettings EnableValidation="true" CommandsToValidate="PerformInsert,Update" />
<ItemStyle Wrap="false" />
<ActiveItemStyle Wrap="false" />
</telerik:RadGrid>
</ContentTemplate>
</asp:UpdatePanel>