Issues migrating VisualStateManager related code from .net 3.5 to .net 4

I have various custom behavior classes defined which derive themselves from ControlBehavior class. The ControlBehavior class is missing in .net 4.

Contr开发者_运维技巧olBehavior was part of WPF Toolkit before it was released in .net 4.

So how to proceed?

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You'll probably need to grab the source of the WPFToolkit and implement your own version of that (behavior) class.