Oracle Sql Developer DataModeller not showing ERD in relational model

I am using Oracle Sql Developer Datamodeller to view table relationships as an ERD.

I have selected tables from the schema that are related and have common keys. Still Oracle Sql Developer Datamodeller does not show how the tables are related. Why?
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Gerwin Jansen, EE MVETopic Advisor Commented:
I'm using sql developer, the modeler (for queries) in there is where you have to draw the relations yourself. I'm expecting that datamodeler expects the same, is there a function or wizard available that 'discovers' the model for you?

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gram77Author Commented:
I've requested that this question be deleted for the following reason:

Didn't get the answer
Gerwin Jansen, EE MVETopic Advisor Commented:
Why don't you reply to my comment?
gram77Author Commented:
@Gerwin Jansen:
Apologies, my bad.
The tables don't have primary-foreign keys designated on them.
I had to create them manually and sqldeveloper drew the ERD accordingly.
gram77Author Commented:
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