Hi Cedric,
Thanks for contacting Syncfusion support.
We have checked your query. We suggest you to take the value of change event as args.target.value to resolve the reported issue.
this.onOptionChange = (args) => {
// expected value of args.value are: cm, m and mm
this.CustomVolumeRef.format = '###' + args.target.value;
//this.CustomVolumeRef.refresh();
}
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We have made a simple sample. Please find the sample in the below link. If we misunderstood your query, kindly revert with some more additional information or if possible try to reproduce the reported issue in the attached sample that will help us to validate the issue further and provide you a better solution from our end.
Regards,
Jeyanth.