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Control.InvokeRequired Not Found Or Missing In WPF

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Hello,

I was doing a little WPF threading recently which involved changing my codes from Winforms to WPF. Surprisingly, I was not able to find the code below in the intellisense: 
Control.Dispatcher.CheckAccess()
After googling, I found this link: Why is Dispatcher.CheckAccess() hidden from intellisense?
I wonder why Microsoft hid some features on intellisense. Or it could be a bug.

Regards!!!

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