Just saw that Blendables have extended their portfolio of WPF controls. The stuff looks good, but unfortunately, their licensing scheme doesn’t:
A license is required for each machine utilizing the blendables controls. […] As we do not offer a deactivation method, if you must reactivate on a new developer machine you are allowed up to 3 activations. This is for the case of re-imaging or setting up a new developer machine. Once this limit is reached you must contact blendables support at […] to proceed with activation.
I must say, not purchasing their product is a no-brainer…