Winchcombe Seizt cab roof light

good morning fellow RVer's,

can anyone inform me of how to remove the irritating plastic fastner cover's that are around the window cover...tried using a Stanley around the edge,no joy...there's a centre button as well...is there a special tool,(suction device to remove)?....the window appear's to have loosened as I had a few drip's of water on my head on the last rainy trip..hoping by re-tightening the fastner's all will be good

I can’t picture it. Do you have a photo?