How to remove plastic on outside of A pillar T5.1

[transparu]

There is a triangular black plastic trim on the outside of the base of the A pillar. This "matches" with the covering of the base of the door rear view mirror.

I cannot see how this triangular piece is held to the body panel work and need to get it off.

Does anyone have a pic or advice on removing it without breaking it please?

Thanks in advance folks.

[transparu]

Sorted.
Bottom levers out with plastic plug into panel, then the whole slides upward through another plug fixed into lower A pillar.

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