Let me get straight to your questions:
1) Short click event:
You can achieve this by using DataGrid CellTap
command. CellTap handles the tap gesture over a grid cell, that is, the intersection of a data row and a column.
2) Long click event:
RadDataGrid does not provide long click event out of the box as there isn't such a gesture exposed in Xamarin.Forms. As an alternative approach you could handle CellDoubleTap
command which by default is connected with DataGrid editing functionality. In this case when the command is executed, it will navigate to another page instead of going to edit mode.
Please take a look at the attached sample how this commands could be used and let me know if you have any additional questions.
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