Display a Grid as a comboBox's selectedValue - wpf

I was wondering, is it possible to display a grid in a comboBox as its selectedValue (or displayMemberPath) ?
I wanted to do something like that :
It's a screen from Telerik's comboBox, but I wish to do the same in WPF only. I already use a grid inside the dropdown and it works pretty well, and I'd achieve something cool if I could display many rows as a selectedValue. I supposed I'd use a grid but applying a grid in the displayMemberPath style doesn't really work.
My comboBox is inside a DataGridTemplateColumn but I don't think it matters, just saying.
Thanks !

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