Styling of toolbar combobox

[Elgot]

Comboboxes normally look like this (light and dark): but if they are located in a toolbar this is the result:

I'm not sure what the desired look is, but if this style is added to ComboBox.xaml <Style x:Key="{x:Static ToolBar.ComboBoxStyleKey}" TargetType="{x:Type ComboBox}" BasedOn="{StaticResource {x:Type ComboBox}}" /> at least they have the default adonis ui look: