You can add a critical bar style to any view you have created. You are not limited to only seeing this kind of bar in the Tracking Gantt view.
Select the view to which you want to add the new bar. 
Click Format, Bar Styles to show the Bar Styles dialog. 
For the Task bar, edit the Show For Tasks field to Normal, Noncritical. 
Select the row under the Task style. 
Click the Insert Row button. 
In the Name field, enter Critical. 
In the Show For Tasks field, enter Normal, Critical. 
Leave the From and To fields as they are (Start and Finish, respectively) 
Change the Middle bar color to Red. 
Click OK. 
The critical tasks in this view will now be colored red. 
