or
<telerik:RadGrid runat="server" ID="RadGrid1" EnableEmbeddedSkins="False" Skin="Default" Width="100%" AutoGenerateColumns="False" OnNeedDataSource="RadGrid1_NeedDataSource" AllowMultiRowSelection="True" AllowFilteringByColumn="True"> <HeaderStyle HorizontalAlign="Left"></HeaderStyle> <ItemStyle HorizontalAlign="Left"></ItemStyle> <AlternatingItemStyle HorizontalAlign="Left"></AlternatingItemStyle> <ClientSettings AllowColumnsReorder="False" EnablePostBackOnRowClick="False"> <Scrolling UseStaticHeaders="True" AllowScroll="True" ScrollHeight="500px"/> <Resizing AllowColumnResize="True" EnableRealTimeResize="False" ClipCellContentOnResize="True" /> <Selecting AllowRowSelect="True"/> </ClientSettings> <MasterTableView AllowPaging="True" AllowSorting="True" PageSize="500" TableLayout="Fixed" Width="100%" <Columns> <telerik:GridClientSelectColumn UniqueName="cbColumn" HeaderStyle-Width="3%" HeaderStyle-HorizontalAlign="Left" ItemStyle-HorizontalAlign="Left"/> <telerik:GridBoundColumn UniqueName="ID" Visible="False" DataField="ID"/> <telerik:GridBoundColumn UniqueName="ConfNo" HeaderText="Conf No" DataField="ConfNo" HeaderStyle-Width="20%" FilterControlWidth="65%"/> <telerik:GridBoundColumn UniqueName="Set No" HeaderText="Set No" DataField="SetNo" HeaderStyle-Width="20%" FilterControlWidth="65%"/> <telerik:GridBoundColumn UniqueName="Name" HeaderText="Name" DataField="Name" HeaderStyle-Width="57%" FilterControlWidth="85%"/> </Columns> </MasterTableView></telerik:RadGrid>

<telerik:RadGrid ID="TaskRadGrid" runat="server" OnNeedDataSource="RadGrid_NeedDataSource" Width="100%" EnableEmbeddedSkins="False" Skin="MySkin" AllowPaging="True" OnItemCommand="RadGrid_ItemCommand" AllowSorting="True" OnItemInserted="RadGrid_ItemInserted" OnPreRender="RadGrid_PreRender" OnItemDataBound="RadGrid_ItemDataBound" AllowFilteringByColumn="True" CellSpacing="0" Culture="it-IT" GridLines="None" > <PagerStyle Mode="NextPrevAndNumeric" /> <MasterTableView AutoGenerateColumns="False" EditMode="InPlace" DataKeyNames="Id, Ambiente, Asset.Id" Width="100%" Name="Task" CommandItemDisplay="Top" HierarchyLoadMode="Client"> <CommandItemSettings AddNewRecordText="" RefreshText="" /> <NestedViewTemplate> <telerik:RadSplitter ID="RadSplitter1" runat="server" Width="100%" Height="250"> <telerik:RadPane ID="PlannedAndActualPanel" runat="server" Scrolling="None" Width="24px" > <telerik:RadSlidingZone ID="PlannedAndActualSlidingZone" runat="server" Width="24px" ClickToOpen="true"> <telerik:RadSlidingPane ID="PlannedAndActualPane" Title="Planned" runat="server" Width="260px"> .... </telerik:RadSlidingPane> <telerik:RadSlidingPane ID="RadSlidingPane2" Title="Actual" runat="server" Width="260px"> ... </telerik:RadSlidingPane> </telerik:RadSlidingZone> </telerik:RadPane> <telerik:RadSplitBar ID="RadSplitBar1" runat="server"> </telerik:RadSplitBar> <telerik:RadPane ID="MiddlePane" runat="server" Width="100%" Scrolling="None" CssClass="stretch"> <telerik:RadSplitter ID="RadSplitter2" runat="server" Width="100%" ResizeWithParentPane="true"> <telerik:RadPane ID="RadPane2" runat="server" Width="100%" Scrolling="None" ResizeWithParentPane="true"> <telerik:RadGrid ID="RadGrid2" runat="server" OnNeedDataSource="RadGrid2_NeedDataSource" Width="100%" EnableEmbeddedSkins="False" AllowPaging="True" OnItemCommand="RadGrid2_ItemCommand" AllowSorting="True" OnItemDataBound="RadGrid2_ItemDataBound" AllowFilteringByColumn="True" CellSpacing="0" Culture="it-IT" GridLines="None"> <MasterTableView AutoGenerateColumns="False" EditMode="InPlace" DataKeyNames="Id, Ambiente" Width="100%" AllowFilteringByColumn="false" Name="TaskOperations" CommandItemDisplay="Top"> <CommandItemSettings AddNewRecordText="" RefreshText="" /> <AlternatingItemStyle CssClass="gridAltRow" /> <ItemStyle CssClass="gridRow" /> <HeaderStyle CssClass="gridHeader" /> <Columns> ... </Columns> <EditFormSettings> <EditColumn ButtonType="ImageButton" /> </EditFormSettings> </MasterTableView> <ClientSettings> <ClientEvents OnRowDblClick="RowEditOnDblClick"> </ClientEvents> </ClientSettings> </telerik:RadGrid> </telerik:RadPane> <telerik:RadSplitBar ID="RadSplitBar2" runat="server"> </telerik:RadSplitBar> <telerik:RadPane ID="RadPane1" runat="server" Width="24px" Scrolling="None"> <telerik:RadSlidingZone ID="RadSlidingZone1" runat="server" Width="24px" ClickToOpen="true" SlideDirection="Left"> <telerik:RadSlidingPane ID="CatalogOperationsRadSlidingPane" Title="Catalog operations" DockOnOpen="true" runat="server" IconUrl="img/gears.png"> ... </telerik:RadListBox> </telerik:RadSlidingPane> </telerik:RadSlidingZone> </telerik:RadPane> </telerik:RadSplitter> </telerik:RadPane> </telerik:RadSplitter> </NestedViewTemplate> <Columns> ... </Columns> <EditFormSettings> <EditColumn ButtonType="ImageButton" /> </EditFormSettings> </MasterTableView> <ClientSettings> <ClientEvents OnRowDblClick="RowDblClick" OnHierarchyExpanding="CollapseOtherRows"> </ClientEvents> </ClientSettings> <FilterMenu EnableEmbeddedSkins="False"> </FilterMenu> <HeaderContextMenu EnableEmbeddedSkins="False"> </HeaderContextMenu> </telerik:RadGrid>