How to target BeginInsert to detail level of hierarchy?

[Wellpartner]

I have a master/detail hierarchy implementation (see attached picture).

I have coded to RowLoaded event to set GridViewRow.IsExpandable = false for master rows whose detail collection is empty.  I wanted to visually show that there were no associated details, and save the user from clicking on the (+) expander control needlessly.  I have set ShowInsertRow="True", and my preference is to keep ShowInsertRow="False".  Instead, I would like to have a button (elsewhere in the UI) to call the BeginInsert() method.  However, how do I target the detail level - particularly if the master row has an empty detail collection?

[Maya]

Hi Wellpartner,

A possible approach for your case may be to add a specific button for inserting items in the child grid. Thus during its Click event, you may add a new item in the collection, filling up the nested RadGridView.
You may find more information about the method applied in the attached sample project in this blog post.  

All the best,
Maya
the Telerik team

[Wellpartner]

Thank you, Maya.