There are many variation of the checkboxes behavior depending on several factors. Could you please elaborate a bit more on your scenario: is the built-in checkbox support enabled or custom checkboxes are used in the data template; is the tri-state mode enabled; are you using data binding to CheckState property.
I assume you are using build-in checkbox support with enabled tri-state mode.
If there is binding to the CheckState property the binding will take precedence. This means that check state values in the view model will override those from tristate mode. Thus you should implement the logic yourself.
If there is no binding could you please specify how are you changing the CheckState. The best approach would be to send us a small sample project simulating the issue (via the ticketing system).
You could take advantage of the support ticketing system (http://www.telerik.com/account/support-tickets/new-support-ticket.aspx) in cases when you need a prompt response to urgent issues. This is the best way to reach our support staff - the support system assigns a response time for all of your questions,
depending on your license and ensures that all questions will reach the respective developers, if needed.
I'm looking forward for your post.
the Telerik team
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