protected override void ToggleButtons()
{
var topPosition = PointToClient(TopControl.PointToScreen(Point.Empty));
_btnScrollUp.Visible = (GetVerticalScrollPosition() > 1);
BottomControl = BottomPredicateCheck() ? (Control)progressBar : panelResultsLabel;
var bottomPosition = PointToClient(BottomControl.PointToScreen(Point.Empty));
_btnScrollDown.Visible = (bottomPosition.Y + BottomControl.Height) > this.ClientSize.Height;
}
