If so, place a bracket at the { before "DataGrid tGrid" and keep pressing F11 untill you get to a error. If you get to any. If no error raises I can only assume the action you are performing in HintsGrid_CellEditEnding clears your datagrid or even application.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.