private function toggleFlipCheckMarker():void
		{
			for (var i:int = 0; i < boardWidth; i++)
			{
				for (var j:int = 0; j < boardHeight; j++)
				{
					if (gameFieldList[i][j].flipCheck == undefined)
					{
						addChild(gameFieldList[i][j].flipCheck);
					}
					else
					{
						removeChild(gameFieldList[i][j].flipCheck);
					}
				}
			}
		}