How to fire buttons events(down,up) at the same time?

I use tk2d tool kit and i use two buttons and i want perform Button Down or Button Up States at the same time of that both buttons.

I have 2 buttons for 2 user means each user have its own button. User have two events button down and button up.I want to Find Which user's button up event fired first.

I used tk2d for perform those things. But main problem is that When 1st user press own button down then after 2nd user press its own button down at that same time 1st users button automatically button up so how can i solve this problem.Means that both user cant press button down in this situation.

I want both user can fired its own button down and up both event whatever he/she want. Thanking To You.

How it can possible ?