Hello,

Thank you for contacting Infragistics Developers Support! We do not have an option like this but this is easily achievable. First thing we need to do is to cancel rowExpanding and rowCollapsing events. Then we bind to the double click event of the expanding cells. In its handler we call  expand or collapse methods of the Hierarchical Grid. I prepared a sample that demonstrates the approach.

I hope this helps!

Kind regards,

Petko Zhekov

Software Developer