private void InitializeFilterView(FilterView filterview) { var okButton = FindControl.FindChild <Button>(filterview, "btnOk"); okButton.Click += OnPopupButtonClick; var cancelButton = FindControl.FindChild <Button>(filterview, "btnCancel"); cancelButton.Click += OnPopupButtonClick; var clearButton = FindControl.FindChild <Button>(filterview, "btnClear"); clearButton.Click += OnPopupButtonClick; filterview.LostFocus -= PopLostFocus; filterview.LostFocus += PopLostFocus; filterview.Focus(); filterview.UpdateLayout(); }