It’s an old question, but for anyone still looking into this, I was able to draw the default details panel by looping through all the children and adding them one at a time:
// Draw default Properties
uint32 NumChildren = 0;
PropertyHandle->GetNumChildren(NumChildren);
for (uint32 i = 0; i < NumChildren; i++)
{
ChildBuilder.AddProperty(PropertyHandle->GetChildHandle(i).ToSharedRef());
}
// Draw customization
// ...
Cheers,
Guilherme