Hi Mathieu WERQUIN,
Greetings from Syncfusion support,
Regarding your query about adding a color picker when
editing in dialog mode in the grid, we have previously discussed this topic and
provided guidance on how to render the color picker component for a specific
column during the editing process in our knowledge base. The knowledge base
article includes a sample that demonstrates how to achieve this. You can modify
the edit mode to dialog as per your requirements.
KB- https://support.syncfusion.com/kb/article/10014/how-to-render-colorpicker-component-for-particular-column-while-editing-a-record
Please refer the below sample for more reference,
Regards,
Vikram S