I was building a Card which would be placed at the bottom of the screen, ExpansionTile is the child of this widget. When I click this card, the showModalBottomSheet() is called in OnExpansionChanged, however, I don't know how to close it. An open and close feature would be nice.

code reference: https://gist.github.com/ritvij-saxena/4726b3a834b8aa4afb7305eda2c970da
Live demo: https://dartpad.dev/4726b3a834b8aa4afb7305eda2c970da