I have a situation with the grid doesn't have the triangle sign. It is supposed to have it like the image attached.
<StackPanel Orientation="Vertical"> <TextBlock Text="xxxx" HorizontalAlignment="Center"></TextBlock> <telerik:RadGridView Name="radGridView" RowLoaded="radGridView_RowLoaded" Width="1025" IsReadOnly="True" ValidatesOnDataErrors="None" AutoGenerateColumns="False" IsFilteringAllowed="False" ShowGroupPanel="False" ShowColumnFooters="False" CanUserResizeColumns="False" CanUserFreezeColumns="False" SelectionMode="Single" CanUserReorderColumns="False" CanUserSortColumns="False" CanUserInsertRows="False" CanUserDeleteRows="False" CanUserSelect="False" RowIndicatorVisibility="Visible" Height="265" ItemsSource="{Binding Information}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" > <telerik:RadGridView.Columns>What I missed?