I'm trying to implement a custom button using JToolBarHelper::custom, my code is as follows:
JToolBarHelper::custom('message.resend', 'email.png', 'Resend Email', 'Resend Email', false);
The button displays fine, only issue is I can't get the icon to display with it. I've tried going off of this documentation: https://docs.joomla.org/J1.5:How_to_create_a_custom_button but it is outdated and isn't working for me. Anyone know the proper way to load in a custom icon?