Summary: no tooltips for "NumericUpDown"

see http://www.syncfusion.com/FAQ/WinForms/FAQ_c54c.asp#q1007q
"When tooltips are set on a control that hosts other controls within it (like the numeric updown), tooltips are not shown on those child controls."

Because "Tooltip" is sealed to get no chance to fix it with a workaround inside a custom "Tooltip-class".. -- Jtb

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Seems to be fixed in dotnet-framework 2.0 - can someone give an ""ACK""?