Specifies an associated block rule that closes (opens) text range.
property BlockEndCond: TTagBlockCondition;
If BlockType is btRangeStart, BlockEndCond specifies condition that closes text range.
If BlockType is btRangeEnd, BlockEndCond specifies condition that had been used to create text range.
It is recommended to specify associated rule in the starting block rule (BlockType = btRangeStart).