Why use a modeless dialog box to add the Rhino object with Ctrl+Z cannot undo
Undo is command based. That is, anything that happens to the current document within a command’s RunCommand() member is undo-able.
A modeless dialog does not run within the context of a command. A command might create a modeless dialog. But the dialog remains visible after the command finishes.
To make “stuff” you do in a modeless dialog undo-able, you have two options:
1.) Have your modeless dialog run a command using
2.) Have your modeless dialog create it’s own Undo record. For example:
var undo_record = doc.BeginUndoRecord("My Undo-able Stuff..."); // TODO: modify document here if (undo_record > 0) doc.EndUndoRecord(undo_record);
Does this help?
Thank you very much