Fixing type for DOM Elements

This commit fixes the type for DOM Elements in CPTextView.j

AppKit/CPTextView/CPTextView.j

@@ -111,7 +111,8 @@ var kDelegateRespondsTo_textShouldBeginEditing
 
     BOOL                        _scrollingDownward;
 
-    var                         _caretDOM;
+    DOMElement                  _DOMElement;
+    DOMElement                  _caretDOM;
     int                         _stickyXLocation;
 
     CPArray                     _selectionSpans;
@@ -529,7 +530,7 @@ var kDelegateRespondsTo_textShouldBeginEditing
         style.whiteSpace = "pre";
         style.backgroundColor = "black";
         _caretDOM.style.width = "1px";
-        self._DOMElement.appendChild(_caretDOM);
+        _DOMElement.appendChild(_caretDOM);
     }
 
     _caretDOM.style.left = (aRect.origin.x) + "px";