Give the area an id.

headers/libs/alm/ALMLayout.h

@@ -65,6 +65,7 @@ public:
 			void				SetSpacing(float spacing);
 			float				Spacing() const;
 
+			Area*				AreaFor(int32 id) const;
 			Area*				AreaFor(const BView* view) const;
 			Area*				AreaFor(const BLayoutItem* item) const;
 			int32				CountAreas() const;

headers/libs/alm/Area.h

@@ -65,6 +65,9 @@ class Area {
 public:
 								~Area();
 
+			int32				ID() const;
+			void				SetID(int32 id);
+
 			BLayoutItem*		Item();
 
 			XTab*				Left() const;
@@ -121,6 +124,7 @@ private:
 			void				_UpdateMaxSizeConstraint(BSize max);
 private:
 			BLayoutItem*		fLayoutItem;
+			int32				fID;
 
 			LinearSpec*			fLS;