Hi Cholet,
Thanks for using Syncfusion products.
We have analyzed your issue and we are unable to reproduce the issue.
We have created a sample based on your query and the same can be downloaded from the following link,
In the above sample we have opened the Dialog while double clicking on the row and checked that whether DataManager is reload the data or not.
Please provide the below details to reproduce the issue,
1. Share the code example that you have tried in your end.
2. Did you use any post back while switching between tabs?
3. Did you use Dialog template edit or render the dialog externally in RecordDoubleClick event?
The provided information will help to analyze the issue and provide you the response as early as possible.
Regards,
Gowthami V.