Hi Ariel,
Thanks for using Syncfusion products.
We have created a sample to illustrate the setting Icon for the Tabs which you can download it under the following location.
In this sample, we are using SetIcon method to set the Icon. Using this Method you can able to set the flashing icon in the tab when the certain condition is matched.
Please let me know if the sample helps.
Regards
Surya Narayana
F101794_DM_SetIcon_50f64ea8.zip