title: WPF DataBinding - entirely confused
body: <p>Gosh! I hate this. Why it is so complicated?</p>
  
  <p>What I'm trying to do:</p>
  
  <p>I have a form with several UserControls each with a DataGrid. Each grid bind with ObservableCollection through .ItemSource property, everytime when program catches an event, it makes changes in one of the implied collections. But a picture of a grid doesn't update. </p>