Yes, I am using the latest assembilies.
The format how the Grid is layed out is the following:
<UserControl>
<StackPanel>
<StackPanel>
<telerikDocking:RadDocking>
<telerikDocking:RadDocking.DocumentHost>
<telerikDocking:RadSplitContainer>
<telerikDocking:RadPaneGroup>
<telerikDocking:RadDocumentPane>
<Grid>
<Grid>
Styles
</Grid>
<telerikNavigation:RadTabControl>
<telerikNavigation:RadTabItem>
<Grid>
<telerikBusy:RadBusyIndicator>
<telerikDataGrid:RadGridView>
<telerikDataGrid:RadGridView.Columns>
Parent Columns
</telerikDataGrid:RadGridView.Columns>
<telerikDataGrid:RadGridView.RowDetailsTemplate>
<DataTemplate>
<telerikNavigation:RadTabControl>
<telerikNavigation:RadTabItem>
<telerikDataGrid:RadGridView />
<telerikDataGrid:RadGridView.Columns>
Child Columns
<telerikDataGrid:RadGridView.Columns>