not returning synthetic event in callback function.

[zeeshanweb-official]

hi there,
i want the synthetic react event created on the selection of chip.
but i am unable to find any...
is there any way to get there???
like i am calling a function on chip selection.
and want there the synthetic and general way of event.target to get the dynamic name i assign to the component.
like
<Chips
value={this.state.user.medicines}
onChange={this.changemedicines}
name={"medicine"+item}
suggestions={this.state.medicines}
placeholder="click to add medicines"
/>
but it doesn't returns any event but only a chip...
what i can do???