Windows will interpret any touch anywhere on a touch screen as a left mouse click. This can be an issue if you have the left mouse button set to start a session or other command in the Controls tab (see example item 2 below). With a touch screen and the left mouse button set to anything other than "Not used" any touch on the screen will override the command set for your buttons. Set the left mouse button to "Not used" and then any touch button command should work properly. You may also need to make sure the button is the top most layer in your screen design and no other text box or other screen element is covering it so that a touch on the button is detected.