title: ag-grid: Using Grid Event CellClicked for specific column - cannot access "this"
body: <p>I have a column in grid which when clicked I am trying to access some method of class but the <code>this</code> context has changed and not available. 
  Ex -</p>
  
  <pre><code>export class PreTflGridComponent implements OnInit {  
  
    columnDefs = [
      {onCellClicked: this.editCellClicked}
    ];
  
    constructor() { }   
  
    method(): void {
        console.log('working');
    }
  
    editCellClicked(params) {
      this.method();
    }  
  
  }
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>ERROR TypeError: this.method is not a function
  </code></pre>
  
  <p>How can I access the methods/properties once the <code>this</code> context has changed.</p>
  
  <p>Refer below for the exact issue
  <a href="https://stackblitz.com/edit/angular-vwgcc2" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-vwgcc2</a>, if you will click the column make and open up console then it would show the error I am facking. </p>