How to show the pop-up control as Tooltip in WinForms?

this.gradientLabel1.MouseEnter += new System.EventHandler(this.gradientLabel1_MouseEnter);
this.gradientLabel1.MouseLeave += new System.EventHandler(this.gradientLabel1_MouseLeave);
private void gradientLabel1_MouseEnter(object sender, EventArgs e)
       {
           this.gradientPanelExt1.Show();
           this.popupControlContainer1.ShowPopup(Point.Empty);
       }
       private void gradientLabel1_MouseLeave(object sender, EventArgs e)
       {
           this.popupControlContainer1.HidePopup();
       }

Private Sub gradientLabel1_MouseEnter(ByVal sender As Object, ByVal e As EventArgs) Handles gradientLabel1.MouseEnter
                Me.gradientPanelExt1.Show()
                Me.popupControlContainer1.ShowPopup(Point.Empty)
End Sub
Private Sub gradientLabel1_MouseLeave(ByVal sender As Object, ByVal e As EventArgs) Handles gradientLabel1.MouseLeave
                Me.popupControlContainer1.HidePopup()
End Sub