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how to use a xaml file in WPF that does not have an .cs

Echo 3 years ago updated by ไอยดา สุรีวงค์ 3 years ago 1

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I have a .xaml file from, HelixToolkit how do I use it in Microsoft Visual Studio? Is don't have a .cs. has anyone used this before?

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And I cannot see it, it will not come up.

how do I use this ?