Unfortunately the fact that these features got folded into WPF itself means that there a number of naming clashes between the toolkit and WPF 4. This has been reported on the forums a few times and there is also a thread in which someone from MS China states “the WPF Toolkit will not be updated to 4.0 anytime soon”.
I really needed to use the charting controls from the toolkit and I didn’t want to deal with naming conflicts, so I forked the WPF Toolkit from Codeplex into a Bitbucket repo, upgraded it to .Net 4.0 and VS 2010 and removed all the bits which conflict with WPF 4. The following have been removed:
VisualStateManager
DataGrid
Calendar
DatePicker
Read more: #Fellows
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