How to hide the Expand buttons for grouping rows

Description:
Sometimes grouping is used to create a particular structure to represent data and it is undesirable to allow users to collapse any grouping row. Is there any way of hiding the expand buttons and prevent users from collapsing group rows?

Answer:
The solution to this problem is to create a new View class which will support this functionality itself. This will prevent you from having to alter our source code everytime you install a new update of the ExpressQuantumGrid Suite.
The ExpressQuantumGrid has a rather flexible structure which allows you to change practically any aspect of its behavior by creating a new View class. A number of such examples are posted in the How to Utilize the QuantumGrid's Flexibility to Implement a New Feature in a Derived Class article…
The behavior you asked about is defined by the TcxGridGroupRow.GetExpandable method. So, basically, you need to alter the GridView's implementation in such a way, that it uses your own class instead of the TcxGridGroupRow. Here is the chain which demonstrates how an object of the TcxGridGroupRow class is created:
TcxCustomGridView.CreateHandlers
TcxGridTableView.GetViewDataClass
TcxGridViewData.CreateRecord
TcxGridViewData.GetRecordClass
In your case, you need to create the following classes:
TmycxGridDBTableView - override the GetViewDataClass method
TmycxGridViewData - override the GetRecordClass method
TmycxGridGroupRow - override the GetExpandable method.
Attached you will find a sample project which demonstrates how this can be implemented. We hope it will be helpful to you.