Not the answer you are looking for but this widget is no longer maintained and should not be used anymore.
Regards,
Ronald
Maybe the widget DataTables is an usable alternative for you?
I'm not aware of any other widgets that offer that functionality, except for perhaps DataTables, which is a completely separate grid implementation.
If you look on GitHub, there are a few forks that fix some functionality for Mendix 7. But Ronald is right, it's not supported by the original widget author anymore.