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ToggleButton only shown at one node of XamDatatree

I'm using XamDataTree. The tree to display has nodes of several types. Every node can have subnodes of more than one type. That's why all node type view models are derived from the same base node view model and have different layouts. The "C" node type has a ToggleButton in his layout with different icons on it depending on the IsChecked state.
The problem is that the button is only displayed on one node, although multiple Type C nodes exist. How can I solve this problem? To show the situation I append a simple example.

Thanks in advance.