Not sure exacty what you are after but you could use the webcontrol <episerver:property><rendersetting../></episerver:property> you could also set an id to a control like <asp:label> or <asp:image> and set the ApplyEditAttributes from code behind.

Didn't know about the RenderSetting, seem to be exactly what I'm looking for.

Thanks Eric! :)

I had the same question.  I do not see EditContainerClass as a property of the RenderSetting web control.  Am I missing something?

Did you find a solution for this? I cant get the rendersettings-tip to work.

No, we have unfortunately not been able to get this to work :(

Does not seem to be any EditContainerClass in the webcontrol but that should most of the times be renderd by the control it self. If you have a asp.net webcontrol you can set that from code behind

heading.ApplyEditAttributes<ImageGalleryBlockType>(p => p.Heading);

I fixed it by declaring a property such as this:

<EPiServer:Property runat="server" PropertyName="MainBody">
   <RenderSettings EditContainerClass="overflow-hidden" />
</EPiServer:Property>

And then using jquery to set the class for the property in edit mode, such as this:

<script type="text/javascript">
  $("[data-epi-property-rendersettings]").each(function () {
    $(this).addClass($(this).data('epi-property-rendersettings').editContainerClass);
  });
</script>

The javascript simply loops through all elements in the DOM that has the data-epi-property-rendersettings attribute and sets the class accordingly. Too bad this is not supported by EPiServer though. Using reflector on the source code it looks like EditContainerClass is only for MVC.

<EPiServer:Property runat="server" PropertyName="MyContentArea" >

            <RenderSettings ChildrenCssClass="overflow-hidden" />
        </EPiServer:Property>

This seems to work