Problem editing and updating the row in the nested grid

[Sergej]

Hi Telerik Team

I'm new to Telerik controls  and I'm trying to edit and update the row in the nested grid using custom template. However I cannot get it to work properly, every time I click the edit buttom I'm loosing all the data from the nested grid. I'm using advanced binding for this solution because of both grids are bound to the business objects. Also OnUpdate event gets fired when the edit button is clicked but not Update, so not sure how sould I update the grid ?
I've tried to find some answers online but the the only thing that I was able to fing is how to work with the hierarchical grid which is not what I have.

Please download my demo project that describes the problem from the link below . (Readme.txt included)

https://www.adrive.com/public/339ffcb15bfd1d9b596af104366698a8332d93d70ee7c410a4b34f6ff7b15676.html 

Thanks

[Maria Ilieva]

Hello Sergej,

I review your code and suppose that the issues you are facing are caused by mixed binding types for the child RadGrid. You are setting DataSource for it in the parent Grid ItemDataBind event and also have set NeedDataSource. Note that such mixed binding (simple and advanced) is not supported for RadGrid control and may lead to a lot of different issues. You should never call DataBind() as well when using advanced data-binding through NeedDataSource.

All the best,
Maria Ilieva
the Telerik team