ve();

      this.chartCtx_.shadowOffsetX = 0;
      this.chartCtx_.shadowOffsetY = 5;
      this.chartCtx_.shadowBlur = 4;
      this.chartCtx_.shadowColor = 'rgba(0,0,0,0.4)';

      this.chartCtx_.strokeStyle = '#888';
      this.chartCtx_.fillStyle = '#EEE';
      this.chartCtx_.fillRect(left, top, tooltipWidth, tooltipHeight);

      this.chartCtx_.shadowColor = 'transparent';
      this.chartCtx_.translate(0.5, 0.5);
      this.chartCtx_.strokeRect(left, top, tooltipWidth, tooltipHeight);

      this.