Hi
Fanourios siskakis,
Query : how i can override the
Comboboxe's TextBox style.
You can achieve your requirement using below code.
code:
<syncfusion:ComboBoxAdv>
<syncfusion:ComboBoxAdv.Resources>
<Style TargetType="{x:Type TextBox}">
<Setter Property="FontSize" Value="20"/>
</Style>
</syncfusion:ComboBoxAdv.Resources>
</syncfusion:ComboBoxAdv>
output:

If we misunderstood the query, please provide more details about the
requirement, or modify our sample and revert to us with a reproducible issue or
video. So, it will be helpful to prompt the solution on further.
Regards,
Mahalakshmi sugumar