How to connect in new UI bool variable with button ?

[Slava_F]

I want to simulate pressing space by button from new UI. What I thought is to create new bool variable and connect it to button from UI. But how to do it? I want bool=true as long as button pressed, and bool=false - when released.
thanks

[Andrew_Kenady]

bool _pressed = false;

void OnGUI () 
{
	GUI.Box(new Rect(10,10,180,80), "Debug Menu");
	_pressed = GUI.Button(new Rect(20,40,160,20), "Space");
}