Hi Marco,
In Design mode, right-clicking the ComboBoxAdv control, and selecting the options Edit Template -> Edit a Copy, will insert the whole template of the control in your sample, which can be modified as per your requirements.
We have modified the template to make the dropdown icon bigger in the ComboBoxAdv control. Please refer to the attached sample for further reference.
Regards,
Bhaskar Suresh
Attachment:
ComboBoxAdv_Magnify_2ba8ecc5.zip