In Delphi for .NET, members with protected visibility cannot be accessed outside of the assembly in which they are defined. If possible, you may want to use the publicly-exposed members of the class to accomplish your goal. 

Other ways to resolve this error:

• Increase the visibility of the member from protected to public, so it can be accessed outside of its assembly.
• “Link in” the assembly where the protected member is defined, so that this assembly is incorporated into the assembly you are building, and the access will be inside the assembly.