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In the particular case I'd suggest you implement your custom tool based on the default Crop tool. Please find attached a sample project demonstrating how a custom tool can be created. The classes in the project contain the default implementation of the CropTool-related classes, but their names are changed. Additionally, the sample is for Silverlight, but the code base of the WPF and Silverlight controls is the same, so you should be able to port the application easily.
I hope this is helpful! Do not hesitate to get back to us should you have any additional question.
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