Tooltip only showing for less than 1 second

[netdude78]

Sample code:

C# code:

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var b = new wpfBuilder("Window");

b.R.Add<Label>("PTP Domain").AlignContent(HorizontalAlignment.Right);
b.Add<TextBox>(out TextBox ptpDomain).AlignContent(HorizontalAlignment.Left).Tooltip("Integer between 0 and 127");

b.R.Add<Label>("Delay Request").AlignContent(HorizontalAlignment.Right);
b.Add<ComboBox>(out ComboBox ptpDelayReq).Items("Multicast|Unicast");

b.R.Add<Label>("Control Multicast Addressort").AlignContent(HorizontalAlignment.Right);
b.Add<TextBox>(out TextBox controlMC).Tooltip("Control MC").Tooltip("Port must 49999");

b.R.AddOkCancel();
if (!b.ShowDialog()) return;

Regardless of what element has focus (if I click in one of the text boxes), I get inconsistent results with how long the tooltip displays.  Sometimes I get the normal 5000ms display time.  Most of the time it flashes for a moment.  Not even long enough to read.  Any ideas?  I tried using the ToolTipService to set the show duration globally to Int32.MaxValue as someone suggested on stack overflow.  Also tried setting it to just 5000.  Same behavior.