void LoadMatrix(string subjectNumber = "")
        {
            bool isNullSB = subjectNumber == "";
            _eventCRFs = new List<Models.CRFInEvent>();
            tMatrixFixColumns.Rows.Clear();
            var tr = new TableRow();
            var thc = new TableHeaderCell();
            TextBox textBox = new TextBox() { ID = "tbSubjectNumber", CssClass = "form-control snInput" };
            textBox.Attributes.Add("placeholder", Resources.LocalizedText.SubjectNumber);
            thc.Controls.Add(textBox);
            Button btnSearch = new Button() { ID = "btnSearch", Text = Resources.LocalizedText.Search, CssClass = "btn btn-default", OnClientClick= "$(document).ready()" };
            btnSearch.Click += BtnSearch_Click;
            thc.Controls.Add(btnSearch);
        }

        private void BtnSearch_Click(object sender, EventArgs e)
        {
            TextBox tb = tMatrix.FindControl("tbSubjectNumber") as TextBox;

            LoadMatrix(tb.Text);
        }