treeview checkbox readonly

I am building a treeview object which has checkboxes for each node and I need some of these checkboxes to be read-only, based on some criteria.

I have found the following, but an error is thrown.

Private Sub ProductTree_BeforeCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeViewCancelEventArgs) Handles ProductTree.BeforeCheck
End sub

Probably should I use a references?