ASPxGridView - How to access controls inside DetailRow on the client side

Hi Jürgen,
Thank you for contacting us. I would like to note that a detail form with nested controls does not exist until a master row is expanded. Thus, you cannot access nested controls that are placed within a collapsed row.
With expanded rows, a situation is more interesting. When you add a control (e.g., ASPxTextBox) into the detail row and set ClientInstanceName, you expect that you can manipulate the control using its ClientInstanceName. Now imagine the following situation:
- A user clicks the expand button and changes ASPxTextBox text using ClientInstanceName (suppose txt1);
- The user expands another row and wishes to change text of ASPxTextBox that is related to this row. However, it has the same ClientInstanceName that ASPxTextBox from the previous step.
Thus, when a control is placed with a detail row, multiple instances of the control with the same ClientInstanceName are created. As a result, it is impossible to determine which control should be manipulated.
As a solution, set the unique ClientInstanceName for each control in its Init\Load event handler. I refer you to the following sources that demonstrate a similar solution in action:
How to bind the detail GridView to data based on the end-user input
How to refer to a client-side control within a UserControl
The general technique of using the Init/Load event handler
Thanks,
Marion