Thanks for answer
I think it should be notified in this obselete notification the use of the IsRowVisible and the showrow functions as an alternative to the property visible and should also the user be notified that this property will be removed
i updated my project with new functions and all work well , i also removed the property visible to not be confused any more .
About drag and drop , i am always trying to understand how David used it in sourcegrid3 and to simulate it to the current project , i have the hole of summer to try .
I am also trying to understand the design time adding item and cell as well as the default microsoft's datagridview , really will be cool future if i can implement it
I try and i hope get a solution .