TCustomHintWindow = class(TCustomControl)
class PASCALIMPLEMENTATION TCustomHintWindow : public TCustomControl
Custom window to specify properties to allow painting hints.
TCustomHintWindow is a custom window class that specifies the correct properties for painting hints. Basically, it is a layered window that allows alpha blending and invisible pixels. This allows painting a window as a floating balloon for a balloon hint, for instance. TCustomHint uses TCustomHintWindow to paint and size hints.
You don't need to use this class unless you are creating new types of custom hints.