Hi Juan,
Greetings from Syncfusion. We have analyzed your requirement and tried to replicate the reported scenario. We are afraid that we can’t replicate the reported scenario at our end. Sample used for testing n be found below.
In the above sample, we have displayed modal when clicked on the chart region. The image which is added as annotation is behind the modal.
Screenshot:
Without Modal
With Modal
Since we are not aware on the exact scenario on which the issue is reproduced, kindly revert us by modifying the above sample or provide your sample with replication steps. This will be helpful in further analysis and provide you the solution sooner.
Thanks,
Dharani.