RadialMarkingMenu.ClientId Property
Parent Object: RadialMarkingMenuDescription
Read-only property that returns the string that uniquely identifies the client that created this radial marking menu. This is the CLSID of the AddIn in a string form, e.g. "{C9A6C580-3817-11D0-BE4E-080036E87B02}".
If the menu is built-in, an empty string is returned.