So he wants it to toggle? If so you will need 2 bools. One will store the current mode state and the other will store the last state of the button. If the button is true, it will check the the last state of the button. If the last state is false, change the state of the mode.
Here is an example in C++
Code:
//this code is in the class header
bool pressed;
bool value;
//this code is in the initializer
pressed = false;//saves the button press
value = false;//what ever is being toggled
//this code is in the periodic thread
if(joystick->GetRawButton(1))//gets the button value and checks if it is true
{
if(pressed == false)//Checks if the last button state was false
{
value = !value; //flips the value
}
pressed = true;//saves the buttons state
}
else//if the button is not pressed
{
pressed = false;//saves the buttons state
}
I know its not LabView but the concept should be the same.