change combobox style

[sapomuyverde]

Hi,

I 'm using Breeze-gtk theme in an application (running under Windows) , but I have not found how I can change the style of combobox, please can you help me how to change the appearance of the combobox, I especially want to remove the square is seen around the combobox.

I appreciate any help.

Thanks.

best regards,
Javier