AddLayoutRule

Overloaded.  

BuildKey

Builds a key - object for the new rule, as a pair of two objects: obj1 and obj2

GetLayoutRule

If there is rule with key - Key initializes - Value otherwise fails;

RemovetLayoutRule

If there is rule with key - Key removes the key - value, otherwise fails;

ValidateRules

Checks if there is a rule for each key in KeyList