'this will select a tab page without changing the current focus
'https://stackoverflow.com/questions/4044711/select-tab-page-in-tabcontrol-without-stealing-focus
Private Sub SelectTabWithoutFocus(tabPg As TabPage)
    'cache the current focused control (ActiveControl), select the tab which makes it the current tab (and also sets the focus to the tab),
    'and finally re-set focus to the original control.
    Dim prevFocusedControl = Me.ActiveControl
    If Me.ActiveControl IsNot Nothing Then
        tbcMain.SelectedTab = tabPg
        If prevFocusedControl.CanFocus Then prevFocusedControl.Focus()
    End If
End Sub