Set ToolTip for AutoGenerated column

[Pranay]

I want to set ToolTime for autogenerated column at runtime without changing the style for headercolumn

here what i tried so far

<telerik:RadGridView.Resources>
<Style TargetType ="telerik:GridViewHeaderCell">
<Setter Property="ToolTipService.ToolTip" Value="{Binding Content, RelativeSource={RelativeSource Self}}"/>
</Style>
</telerik:RadGridView.Resources>

 but Value="{Binding Content, RelativeSource={RelativeSource Self}}" is generating exception need help ASAP but I have demo today if possible , I already read other answer but changing header style is not good option for me.

I am using new build of silverlight controls

[Tobias]

Hi,
do you know a solution how to solve it, now? Thanks. :)
- Tobi

Update: A helpful blogpost: http://pranayamr.blogspot.ca/2012/08/assign-tooltip-to-dynamically-created.html