FMX: derived class is not painted

If you create a new class which inherits from a standard class such as TCustomEdit you need to set the property

StyleLookup.

Example:

StyleLookup := 'comboeditstyle';

Otherwise the controls stays empty at paint time.

FMX also has different paint procedures.

If you have a component which paints itself in addition to the default, you may need to use

procedure AfterPaint; override;