Moving the Propreties Table's Grip in a dynamic block

Hello,

I have a dynamic block, that represents a stirrup.

I inserted in the block a Block Propreties Table, that have some preset dimensions for the stirrups. The grip of this table I decided to put in the top right corner.

The problem is that I can't make this grip moveable )

Please help, if it is possible )

See the attachement with the block

Thanks in advance.