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?