on shell I have 2 shell renderers but not working correctly how to fix ?

on shell ı have 2 shell renderers but not working correctly because blocking each other how to fix ? using both... thanks

**for custom tab image

protected override IShellItemRenderer CreateShellItemRenderer(ShellItem shellItem)
{
return new CTabShellItemRenderer(this);
}

**for custom tabs

protected override IShellBottomNavViewAppearanceTracker CreateBottomNavViewAppearanceTracker(ShellItem shellItem)
{
return new CBottomNavViewAppearance();
}