(1) Operations:

1. Close: Close the window by clicking the `x` button in the top right or the `Cancel` button in the bottom right of the window.
2. Confirm: Type a certain number in the field, and click the `Confirm` button to confirm the amount. If you change your mind after confirming,
            you can click the `Cancel` button to cancel the deal.
3. Agree: Put your item in the trade window, and check if the money or item to be traded is right, then click the `Confirm` button to send a trade request. If the target also agrees,
         the deal is done.

(2) Display:

Trade Target: It shows the name of the player that you`re trading with.
Price: It shows the money the target would like to pay. 0 means no money.
The target`s items to be traded are displayed in the 6 slots above. Move your mouse over the item to see its detail.
Put your items in the slots below. If you change your mind, you have to cancel this deal by clicking the `Cancel` button.