libraries/ManiaLib/Gui/Cards/Navigation/Button.php
function setSelected()
    {
        $this->isSelected = true;

        $this->selectedIcon = new \ManiaLib\Gui\Elements\Icons64x64_1(11);
        $this->selectedIcon->setSubStyle(\ManiaLib\Gui\Elements\Icons64x64_1::ShowRight);
        $this->selectedIcon->setValign('center');
        $this->selectedIcon->setPosX(71);
        $this->addCardElement($this->selectedIcon);
    }
function setSelected()
    {
        $this->isSelected = true;

        $this->selectedIcon = new \ManiaLib\Gui\Elements\Icons64x64_1(11);
        $this->selectedIcon->setSubStyle(\ManiaLib\Gui\Elements\Icons64x64_1::ShowRight);
        $this->selectedIcon->setValign('center');
        $this->selectedIcon->setPosX(71);
        $this->addCardElement($this->selectedIcon);
    }
Sets the button selected and change its styles accordingly