binding to radgridview's parent datacontext

[Michele]

Hello,
I would like to know if it's possible for a  calculated column to access to the parent's context... I need to calulate over a parameter that's inside the main viewmodel..... I've tried to do 

<telerik:GridViewDataColumn Header="Calculated Max"
                  DataMemberBinding="{Binding Converter={StaticResource calculatedColumnConverter},ConverterParameter={Binding RelativeSource={RelativeSource AncestorType= Grid}}}"></telerik:GridViewDataColumn>

but I got an exception 

{System.InvalidOperationException: Operation is not valid due to the current state of the object.
   at System.Windows.Data.BindingBase.CheckCanReceiveMarkupExtension(IProvideValueTarget provideValueTarget, DependencyObject& targetDependencyObject, DependencyProperty& targetDependencyProperty)
   at System.Windows.Data.BindingBase.ProvideValue(IServiceProvider serviceProvider)
   at MS.Internal.XamlManagedRuntimeRPInvokes.TryApplyMarkupExtensionValue(Object target, XamlPropertyToken propertyToken, Object& value)
   at 

How can I do that?
Thanks

[Pavel Pavlov]

Hi Paolo,

From within the cell you can get access to the row DataContext  rather than the original view model . For such cases as yours we strongly recommend to expose your view model as static resource and use binding to this static resource.

All the best,
Pavel Pavlov
the Telerik team

[Michele]

Helo Pavel,
thanks for your reply....I can't expose the viewmodel since I'm with Caliburn Micro.... so it resolves it automatically
I'll try to put the value I need into the Datacontext's item...I don't like this but I cannot find another solution...