Data binding to bwu_datagrid

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How can we make one-way data binding between Map<int, SomeClass> and Bwu_datagrid like https://www.dartlang.org/docs/tutorials/polymer-intro/#data-binding? I would like to have Bwu_datagrid automatic display data from Map<int, SomeClass> without manual call grid.invalidate(); if any SomeClass object in Map<int, SomeClass> had changes.

class SomeClass extends Object {
  int someClassId;
  String someClassName;
  String someClassDescr}
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Günter Zöchbauer On

There aren't many options. What you could do is to make SomeClass observable (https://stackoverflow.com/a/25111790/217408) and listen to changes of each instance and call grid.invalidate() when you receive an event.