How to get selected attribute in a variable?

Hi,

I'm working in LDM model where an attribute (Attribute1) has been used under multiple entities(Entity_A, Entity_B). There is no trace ability links between Entity_A.Attribute1 and Entity_B.Attribute1. So, when I run impact analysis on this attribute, it doesn't show me where else it has been used.

I'm trying to create a custom method to run from menu. This custom method (On EntityAttribute metaclass) will go through all EntityAttributes and list down all entities where this attribute has been used.

My question is : How do I get selected entity attribute from diagram into a variable which I can use to run a check against all entities in model.

Any help is greatly appreciated.

Thanks,
Arvind