public AttributeSetRefinement(AttributeSet attributeSet, AttributeGroup attributeGroup)
 {
     AttributeSet    = attributeSet;
     AttributeGroups = new List <AttributeGroup> {
         attributeGroup
     };
 }
 public AttributeGroupRefinement(AttributeGroup attributeGroup)
 {
     AttributeGroups = new List <AttributeGroup> {
         attributeGroup
     };
 }