Using GUIStyle parameter in GUI.TextArea problem

Hi, everybody!
I try to create a edti control with my own textures. I use well known code like:

//Scroll position and text members
private int scrollPosition = 0;
pribate string mytext = "";
Rect visibleRect = new Rect(0, 0, 100, 200);

protected void OnDraw()
{
//Scrolling area calcualtion
Rect fullarea = new Rect(visibleRect.xMin, visibleRect.yMin, visibleRect.width - 20, visibleRect.height * 3);

//Starting scroll view
scrollPosition = GUI.BeginScrollView(visibleRect, scrollPosition, fullarea);

//Creating Text Area
mytext = GUI.TextArea(fullarea, mytext, 500);

// End the scroll view that we began above.
GUI.EndScrollView();

}

This code is working pretty well. A problem starts when I try to create custom text are. Instead of

//Creating Text Area
mytext = GUI.TextArea(fullarea, mytext, 500);

I use code like this:

GUIStyle textAreaStyle = new GUIStyle();
//textAreaStyle.font = font.font;
textAreaStyle.focused = new GUIStyleState();
textAreaStyle.focused.textColor = Color.black;
textAreaStyle.alignment = TextAnchor.UpperLeft;
textAreaStyle.wordWrap = true;
textAreaStyle.normal.textColor = Color.blue;

GUI.skin.settings.cursorColor = Color.black;

mytext = GUI.TextArea(fullarea, mytext, 500, textAreaStyle);

Now clicking Enter keyboard key doesn't affect on the text: no new line is inserted into the text. I tried to change different parameters of textAreaStyle variable but nothing helps. Please, help me to resolve this problem. How can I create custom TextArea which accepts KeyCode.Return. Thanks in advance