Which design pattern does this implement

class SkinFactory
{
    void Config(string whichSkin){}
    IButton CreateButton() {}
    IPanel CreatePanel() {}
}

class WindowsSkins:SkinFactory
{
    IButton createWindowsThemeBtn() {}
    IPanel createWindowThemePnl() {}
}

class MotifSkins:SkinFactory
{
    IButton createMotifThemeBtn() {}
    IPanel createMotifThemePnl(){}
}

main()
{
    SkinFactory skins = new SkinFactory();
    skins.Config("Motif");
    skins.CreateButton();
    skins.CreatePanel();
}