title: Standard Bottom Sheet in Flutter
body: <p>I'm having very hard time to implement "Standard Bottom Sheet" in my application - with that I mean bottom sheet where "header" is visible and dragable  (ref: <a href="https://material.io/design/components/sheets-bottom.html#standard-bottom-sheet" rel="noreferrer">https://material.io/design/components/sheets-bottom.html#standard-bottom-sheet</a>). Even more: I can not find any example of it anywhere:S. the closes I came to wished result is by implementing <strong>DraggableScrollableSheet</strong> as <strong>bottomSheet</strong>: in <strong>Scaffold</strong> (only that widget has <strong>initialChildSize</strong>)  but seams like there is no way to make a header "sticky" bc all the content is scrollable:/.</p>
  
  <p>I also found this: <a href="https://flutterdoc.com/bottom-sheets-in-flutter-ec05c90453e7" rel="noreferrer">https://flutterdoc.com/bottom-sheets-in-flutter-ec05c90453e7</a> - seams like there the part about "Persistent Bottom Sheet" is the one I'm looking for but artical is not detailed so I can not figure it out exacly the way to implement it plus the comments are preaty negative there so I guess it's not totally correct...</p>
  
  <p>Does Anyone has any solution?:S</p>