[fpc-pascal] Error message: No matching implementation for interface method ...

[John Repucci]

I'm getting the below error messages and I suspect virtualstringtree /
 VirtualTrees.pas is the cause.

The virtualtrees.pas line it objects to is:
  TVTDragManager = class(TInterfacedObject, IVTDragManager,
IDropSource, IDropTarget)


C:\development\lazarus\components\VirtualTreeView\VirtualTrees.pas(1029,20)
Error: No matching implementation for interface method
"IDropSource.QueryContinueDrag(LongBool,LongWord):LongInt; StdCall;"
found

C:\development\lazarus\components\VirtualTreeView\VirtualTrees.pas(1029,20)
Error: No matching implementation for interface method
"IDropSource.GiveFeedback(LongWord):LongInt; StdCall;" found

C:\development\lazarus\components\VirtualTreeView\VirtualTrees.pas(1225,14)
Warning: An inherited method is hidden by
"TVirtualTreeColumn.Equals(TObject):Boolean;"

Any suggestions how I might fix the issue?
Using Laz 1.1 w/fpc 2.6.1 [2012/06/26]