Registers OnCustomButtonClick event handler.
Event handler to register. Must be assigned.
AFirst [in, optional]
True - insert handler as first, False - insert handler as last (default).
ACustom [in, optional]
(for procedural event handlers only)
Custom pointer to be passed into handler.
This pointer is not used by EurekaLog, so you can use it for your own goals.
Can be nil if not used.
Please see description of event handler type for more details about event itself.
Please see unit description for common event concept details.
It's best to call this routine in object's constructor (for method event handlers) or unit's initialization section (for procedural event handlers).
Build date: 2021-10-15
Last edited: 2021-10-15
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