How to set Graph Extensions Loading Priority

Hello Community,

Does anyone know how to prioritize loading the extensions? Let's say I have two or more extensions on a base graph. How we can educate the platform on which one should be executed first and which one next? 

or necessarily I should declare my Graph Extensions hierarchical? For example, if I have a MyExtA that has priority over MyExtB I should do 

public class MyExtA : PXGraphExtension<BaseGraph> {}

public class MyExtB : PXGraphExtension<MyExtA , BaseGraph> {}