var TextBox = function (position) {
    UI.makeControl(this);
    var local = this;

    this.hasFocus = false;
    this.curText = "";
    this.visibleText = "";
    this.visibleTextStart = 0;
    this.texQuad = new Quad({ });
    this.texQuad.setSize(256, 32);
    this.texQuad.setTexture("Interface\\ChatFrame\\UI-ChatInputBorder.blp");
    this.texQuad.setColor(0xFFFFFFFF);
    this.caretPos = 0;
    this.caretQuad = new Quad({});
    this.caretQuad.setSize(2, 15);
    this.caretQuad.setPosition(0, 0);
    this.caretQuad.setColor(0xFFFFFFFF);
    this.prevCaretStr = "";
    this.prevCaretLen = 0.0;
    this.isCaretVisible = true;
    this.caretEvent = new TimedEvent({ This: local, callback: (function(scope) { return function() { scope.caretUpdate(); };})(local), interval: 1000 });
    this.caretEvent.enable();

    this.curPosition = [0, 0];

    if (typeof position !== "undefined") {
        this.setPosition(position);
        this.curPosition = { x: position.x, y: position.y };
    }
}