how to make a type of tool Window Rhino like the Osnap? 
Please share an example in C#
Well, thats a Dockable Panel. @Dale might be willing to point you to the latest/best example on that.
Not sure if this is the latest:
rhinocommon/examples at master · mcneel/rhinocommon (github.com)
Should be a good start.
Kindest
Christian
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I found an example here. 