My google skills fail me. Anyone heard of a control like that for WPF. I am trying to make it look like this (winforms screenshot).
Give a try to CheckComboBox from Extended WPF Toolkit. The main advantage for me is having two lists for binding:
I find this approach more practical. In addition you can specify value and display members of the collections you're binding.
If you don't want to bring a bunch of other controls with CheckComboBox, you can get the source code of it, it's pretty straightforward (need to bring Selector class as well).