Please try to install WinUI nuget Package, And add the resource in Application.Resouce
.
And it contains round corner ToolTip, so you have no need to edit the default style.
Effect
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Tooltip round corner is not working in 1809 verison
Video:- https://ankurt.tinytake.com/tt/Mzk3ODA0NF8xMjIzMjg5NQ
Round corner converted into a rectangle after 1 second.. i want to maintain its round corner
Style Used:-
![alt text][1]
Please try to install WinUI nuget Package, And add the resource in Application.Resouce
.
And it contains round corner ToolTip, so you have no need to edit the default style.
Effect