How can i add a gluepoint on connector

With Drawing, whem I want to add a gluepoint on a connector the shape of the cursor don’t change so I can’t do it. I can do it with other forms… Someone have an idea ?

P.S. : sorry for the misspelling cause I’m french.

I have created bug fdo#74732 to report this shortcoming. It is in the ODF v1.2 spec, but not implemented in LO or Apache OO.