I made a custimized toolbar button to make, from a selection of lines and an attribute block, a block at point 0,0,0. Now I want to rename this block automatically to te name of the attached attribute. In the macro I filled in ^C^C_rename. but I have to type in the name of the old added block with a random A$390453904534 name, and fill in the new name. how can I finish this macro to rename the old block name to the name of the added attribute name?