Irrlicht Engine

yes i have tried but with no result :

There remains an apparent border



https://www.noelshack.com/2017-22-1496132881-menu.png

Hi,

i have used this code to make my tab control transparent :

for (irr::s32 i=0; i < irr::gui::EGDC_COUNT; ++i)
{
irr::video::SColor col = this->skin->getColor((irr::gui::EGUI_DEFAULT_COLOR)i);
col.set(0, 0, 0, 0);
this->skin->setColor((irr::gui::EGUI_DEFAULT_COLOR)i, col);
}

but checkboxes ...