Addressing several issues such as ScrollerBar binding events and DataGrid cell color changes

[WilliamJiangrx]

Is your feature request related to a problem? Please describe.

1. The cell and column header color changes of the dynamic generated column in the GridGrid cannot fill the entire grid. When creating cells and the text inside them (taking Panel wrapping with a TextC as an example), your control will create an additional Grid or Border to contain them, compress their space, and their properties cannot be modified.
   2.Why can't the FindControl method be used to directly retrieve the control's Name property from the outermost layer of the default ScrollBar type in the GridGrid? Why can't the bound Scroll event trigger breakpoints? Why hasn't the position of the scrollbar changed after modifying the Value value in the ScrollBar.
   Forgive me for speaking frankly, you are not concerned about maintaining Avalonia, and many basic strange problems are eroding my trust as a user in you.

Describe the solution you'd like

There is a more detailed explanation and easier implementation for creating a GridGrid, as well as more detailed instructions and precise control for binding events in ScrollerBar and ScrollViewer.

Describe alternatives you've considered

I hope you can take Avalonia seriously and I sincerely hope it can continue to improve.

Additional context

No response