Detect a DataGridView's button click

I have tried some events, but all of them are fired when I click on the button's header, I'd like an event that only fires when thebutton is clicked...
I have already tried these events:  

• CellClick
• CellEnter
• CellClickContent

All of them are fired when I click on the column's header. If there is no event for that, is there a way to check if the BUTTON was pressed ?

Thanks

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