void PoorClicked(object sender, EventArgs e)
        {
            ProductiveData p_Data = new ProductiveData {
                DateHour = DateTime.Now.Hour, DateDay = DateTime.Now.Day, DateMonth = DateTime.Now.Month, ProdutivityLevel = 2
            };

            AppDelegate.db.Insert(p_Data);
            DisbleButtons();
        }
        void RemoveLastPointClicked(object sender, EventArgs e)
        {
            var lastData = new ProductiveData();

            //find last data point
            foreach (var dataPoint in AppDelegate.db.Table <ProductiveData>())
            {
                lastData = dataPoint;
            }

            AppDelegate.db.Delete <ProductiveData>(lastData.DataNum);
            //database is empty
            if (AppDelegate.db.Table <ProductiveData>().Count() == 0)
            {
                DisableButton(b_Clear);
                DisableButton(b_RemoveLastDataPoint);
            }
        }