Type in TextField to make buttons press and vice versa

When I press the above buttons on the GUI (the main menu in the game), letters appear in a textfield at the bottom of the menu. There's just one problem- I would like to type letters into the textfield and, depending on the numbers I entered, the buttons above will be pressed. Each time I try, I cannot configure it. When I try, I cannot type in the text field, as I am constantly assigning a value to the items in the field. Clicking buttons will assign letters- that part is easy. I want to have the choice to press the buttons or paste in a letter combination. I will also have many more parameters which means that I will need many more "letter#" variables, or else I would not go through all of this trouble. Thank you very much for your knowledge and time.

//drag this javascript onto the main camera, which should be the only thing in the scene

 //var classCode: String;

var classCode = ""; public static var playerName = "N. A. B."; var primaryWeapon = "Pistol"; var letter1 = ""; var letter2 = ""; var letter1hold = ""; var letter2hold = "";

var toolbarInt = 0; var toolbarStrings : String[] = ["Team 1","Team 2"];

function OnGUI () { //instructions at top GUI.Label(Rect(100,25,150,30),"Create Your Soldier"); //display health at bottom

 //label "Player Name"
 GUI.Label(Rect(100,50,100,30), "Player Name");
 //Type in Player Name
 playerName = GUI.TextField(Rect(200,50,100,25),playerName);
 
 //buttons for "Team 1" and "Team 2"
 toolbarInt = GUI.Toolbar(Rect(100,75,250,25),
     toolbarInt,toolbarStrings);
     
 if (toolbarInt == 0)
 {
     letter1 = "A";
 }
 if (toolbarInt == 1)
 {
     letter1 = "B";
 }
 
 //display Primary Weapons, print to label
     if (GUI.Button (Rect (200, 100, 100, 30), "Launcher")) 
 {
     primaryWeapon = "Launcher";
     letter2 = "L";
 }
 
     if (GUI.Button (Rect (100, 100, 100, 30), "Pistol")) 
 {
     primaryWeapon = "Pistol";
     letter2 = "P";
 }
 
 //display primary weapon at bottom
 GUI.Label(Rect(100,475,100,25), primaryWeapon);
 
 //display text box for code
     //make: when you click in the box, it highlights all, (search bar?) 
    
 classCode = GUI.TextField(Rect(100,500,100,25),
     letter1 + letter2);//THIS TextField is it!

     //make: when typing in code, it selects buttons for you

// if(letter1=="A") toolbarInt = 0; // if(letter1=="B") toolbarInt = 1; // if(letter2=="L") primaryWeapon = "Launcher"; // if(letter2=="P") primaryWeapon = "Pistol";

 //reset button
 if (GUI.Button (Rect (200, 500, 50, 25), "Reset")) 
 {
     classCode = "";
 }

}

Typing in "AL" into the textField should put you on team A and give you a launcher.