This is not supported customization - you can do it, but you're on your own if you run into problems.
If time permits I will write something about that in my book.
It depends on what it is you want to add there, the entire view is configured in CommerceManagerSiteRoot\Apps\Order\Config\View\Grids\OrderSearch-List.xml
If what you want to add already exists in the datasource you can just configure a new column in that file.
As Quan said it is not supported and you must take special care when upgrading as updating the nuget will override your changes (writing a transform file for your additions is highly recommended).
Hi,
I have a need to customize the order management grid of Commerce Manager (OrderSearch.ascx). I need to add a new column to the grid, is there a way to achieve this?
Currently there is no code behind for the control and it inherits from: Mediachase.Commerce.Manager.Order.OrderSearchList. Is there a way for me to access the code behind (OrderSearch.ascx.cs) and add custom logic to this piece?
Image for reference: https://www.screencast.com/t/wv8wtBXSxAkO