public void setHelpContent(final String helpContentHeading,
                               final SafeHtml helpContent) {
        this.helpContentHeading = helpContentHeading;
        this.helpContent = helpContent;
        updateVisibleState();
    }
Set the HTML content of the help popup.

@param helpContentHeading The heading to show at the top of the popup
@param helpContent        The help content inside the popup
stroom-core-client-widget/src/main/java/stroom/widget/help/client/HelpButton.java