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Hello, I really liked your grid until I put 12 items in it??? I don't know why but it seems to freeze for 5 seconds at start.
Also, I was not able to change column header template as in the Microsoft DataGrid.
I think you can sell your product if you can fix these 2 issues (and other I haven't seen).
If I do abstract the 2 bugs, I feel that you have done a very great work!!!