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_CBtreeKeyDown

Define a callback to a key pressed event.

Prototype :

fun [ObjTree fun [ ObjTree u0 I I] u1 u0] ObjTree

• ObjTree : any button object


• fun [ ObjTree u0 I I] u1 : a callback


• u0 : an user parameter, at your convenience

Return : ObjTree the same object or nil if error

See also :

Example :