How to visually select a row given it's task id?

The code below shows how to select an activity who's task id is 5.

//To get hold of Ganttcontrol

var ganttControl = $('#gantt_container').data("GanttControl");

//To get the ActivityView corresonding to task id 5

var activity = ganttControl.Model.GetActivityById(5);

//To select the row.

ganttControl.SelectedItem = ganttControl.ActivityViews.GetIActivityView(activity);