While working on automating an Infragistics UltraTree control in a C# Winforms application I found that the UltraTree implemented the AccessibleObject model (MSAA). I was ab
Kind of a crummy answer, but I ended up finding that by running under the CLR (flipping /clr on) the correct number of children is returned. So literally same exact code with the only difference being whether or not the /clr compiler switch is specified. I really don't want to run this code under the CLR though so this isn't an ideal solution for me, but it does technically answer my question.
I will have to post another question asking why this might be happening :(
I had the same problem for an infragistics control. If you are able to change the application under test you have 2 options, otherwise i think there is no solution and you are trapped.
a) override the AutomationPeer implementation of your UltraTree, so just create your own CustomizedUltraTree. Here is a useful link on this topic Docu
b) contact infragistics customer support, for me it was just some versioning issue and they were pretty quick and confident.