Project status field (red,yellow,green) is dependent on project tasks, how to stop this dependency ?

[rambo1]

When any of the project tasks do not meet its planned end date , project status is changing to red. 
Client doesn’t want this to happen, project status should only depend on planned end date of project. 
please help me in achieving this .

[Brandon R1]

Is there a way to achieve this without using DOM manipulation??

[Daryll Conway]

Yes, you can use the "Style" options to set the conditions and colours