Inseted picture does not allow to select added elements on it

[vrtareg]

I am trying to build new symbol using it's pdf snapshot.

I have tried to send picture to the back but whenever I try to point to the element drawn over the picture picture is selected first and there is no way to edit symbol parts.

I am not sure if I am doing anything wrong, if there is any possibility to lock picture or make picture temporary non selectable or locked?

Regards, Areg