Help: The problem of eight queens

General:
Problem to place eight queens on a empty chessboard in such a way
that no queen attacks any other queen
Queens can move in vertical,
horizontal and diagonal directions.

Moving buttons:
When inserting buttons to the playing buard.
just click the square where you want to place it.
Removing the inserted button can be done by
clicking the button.

End of the game:
When player has succeed to place same abount
of buttons to the board as its size, that will be end of the game.

New game:
New game can be started clicking again "play" button.