UiPath Core Activities in Visual Studio

I am trying to create a custom activity that’s more complex than the simple ones we can build using the Custom Activity Creator tool. I was wondering if it was possible to reverse engineer the UiPath Core activities to understand how to build more complex custom activties. Is there a way to open the UiPath Core activities code in Visual Studio?

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I’m trying to create a custom activity using Uipath Activity Creator in Visual Studio and i want to create an argument of type falling under “Uipath.Core”, for example “QUEUEITEM” DataType

But i’m unable to see the Uipath.Core in the search results while creating the argument. Any idea on how to add the datatypes of UiPath.Core in Visual Studio Project.

Thanks in Advance!