How to get the location of tab with respect to screen in WinForms TabbedMDIManager?

void tb_TabControlAdded(object sender, TabbedMDITabControlEventArgs args)
{
    args.TabControl.DrawItem += new DrawTabEventHandler(mtp_DrawItem);
}
void mtp_DrawItem(object sender, DrawTabEventArgs drawItemInfo)
{
    MDITabPanel mtp = sender as MDITabPanel;
    // Drawing background,borders,interior as usual
    drawItemInfo.DrawBackground();
    drawItemInfo.DrawBorders();
    drawItemInfo.DrawInterior();
    //If hashtable contains entry for particular window title just update position else add a new entry
    if (!ht.Contains(mtp.TabPages[drawItemInfo.Index].Text))
       ht.Add(mtp.TabPages[drawItemInfo.Index].Text, mtp.PointToScreen(drawItemInfo.Bounds.Location));
    else
       ht[mtp.TabPages[drawItemInfo.Index].Text] = mtp.PointToScreen(drawItemInfo.Bounds.Location);
}

Private Sub tb_TabControlAdded(ByVal sender As Object, ByVal args As TabbedMDITabControlEventArgs)
    AddHandler args.TabControl.DrawItem, AddressOf DrawItem
End Sub
Private Sub DrawItem(ByVal sender As Object, ByVal drawItemInfo As DrawTabEventArgs)
    Dim mtp As MDITabPanel = CType(sender, MDITabPanel)
    ' Drawing background,borders,interior as usual
    drawItemInfo.DrawBackground()
    drawItemInfo.DrawBorders()
    drawItemInfo.DrawInterior()
    'If hashtable contains entry for particular window title just update position else add a new entry
    If Not ht.Contains(mtp.TabPages(drawItemInfo.Index).Text) Then
       ht.Add(mtp.TabPages(drawItemInfo.Index).Text, mtp.PointToScreen(drawItemInfo.Bounds.Location))
    Else
       ht(mtp.TabPages(drawItemInfo.Index).Text) = mtp.PointToScreen(drawItemInfo.Bounds.Location)
    End If
End Sub