THANKS IN ADVANCE
This is my tree list code:
<telerik:RadTreeList ID="tasksListRadTreeList" runat="server" Width="100%"
DataKeyNames="IdTask"
ParentDataKeyNames="IdFather" AutoGenerateColumns="False"
EditMode="InPlace" AllowPaging="False"
oneditcommand="tasksListRadTreeList_EditCommand"
oninsertcommand="tasksListRadTreeList_InsertCommand"
onneeddatasource="tasksListRadTreeList_NeedDataSource"
onitemdatabound="tasksListRadTreeList_ItemDataBound">
<Columns>
<telerik:TreeListSelectColumn HeaderStyle-Width="38px">
</telerik:TreeListSelectColumn>
<telerik:TreeListBoundColumn DataField="NameTask" HeaderText="Title" UniqueName="NameTask" SortExpression="NameTask" HeaderStyle-Width="30%" />
<telerik:TreeListTemplateColumn HeaderText="Start Date" DataField="StartDate" UniqueName="StartDate" SortExpression="StartDate" HeaderStyle-Width="80px">
<ItemTemplate>
<asp:Label ID="label3" runat="server" Text='<%# Eval("StartDate") %>' ToolTip='<%# Eval("EndDate") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<telerik:RadDatePicker ID="startDateRadDatePicker1" Runat="server" SelectedDate='01/01/2012' Width="80" Calendar-CultureInfo="es-CO" Calendar-DateRangeSeparator=" /">
</telerik:RadDatePicker>
</EditItemTemplate>
</telerik:TreeListTemplateColumn>
<telerik:TreeListTemplateColumn HeaderText="End Date" DataField="EndDate" UniqueName="EndDate" SortExpression="EndDate" HeaderStyle-Width="80px">
<ItemTemplate>
<asp:Label ID="label4" runat="server" Text='<%# Eval("EndDate") %>' ToolTip='<%# Eval("EndDate") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<telerik:RadDatePicker ID="endDateRadDatePicker" Runat="server" SelectedDate='01/01/2012' Width="80">
</telerik:RadDatePicker>
</EditItemTemplate>
</telerik:TreeListTemplateColumn>
<telerik:TreeListTemplateColumn HeaderText="Priority" DataField="Priority" UniqueName="Priority" SortExpression="Priority" HeaderStyle-Width="60px">
<ItemTemplate>
<asp:Label ID="label5" runat="server" Text='<%# Eval("Priority") %>' ToolTip='<%# Eval("Priority") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<telerik:RadComboBox ID="priorityRadComboBox" CheckBoxes="True" ShowDropDownOnTextboxClick="True" runat="server" Culture="es-CO" Width="60px"></telerik:RadComboBox>
</EditItemTemplate>
</telerik:TreeListTemplateColumn>
<telerik:TreeListTemplateColumn HeaderText="% " DataField="Percentage" UniqueName="Percentage" SortExpression="Percentage" HeaderStyle-Width="50px">
<ItemTemplate>
<asp:Label ID="label6" runat="server" Text='<%# Eval("Percentage") %>' ToolTip='<%# Eval("Percentage") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<telerik:RadNumericTextBox ID="percentRadNumericTextBox" runat="server" Text='<%# Eval("Percentage") %>' Width="50" MaxLength="3" MaxValue="100" MinValue="0" ShowButton="False" ShowSpinButtons="True"></telerik:RadNumericTextBox>
</EditItemTemplate>
</telerik:TreeListTemplateColumn>
<telerik:TreeListEditCommandColumn UniqueName="EditCommandColumn" ButtonType="ImageButton" ShowAddButton="True" HeaderStyle-Width="70px" AddRecordText="Agregar Subtarea" CancelText="Cancelar" EditText="Editar Tarea">
<ItemStyle CssClass="MyImageButton" />
</telerik:TreeListEditCommandColumn>
</Columns>
</telerik:RadTreeList>
</telerik:RadAjaxPanel>