TinyMCE Image plugin Border Styles dropdown has no Items


Tried to add Border Styles to the image plugin in the TinyMCE in CMS as per Episerver Customizing the TinyMCE editor guide.

I have added the image plugin and enabled image_advtab as per TinyMCE image plugin guide. And when clicked on the image plugin at CMS, it has an advanced tab.

However, when I clicked on the Border Styles in the advanced tab, there are no items in the list/dropdown. How can I add items to the Border Style list ? I have tried the below and it does not work.

public void ConfigureContainer(ServiceConfigurationContext context){

context.Services.Configure(config =>
                        .AddSetting("image_advtab", true)
                    new { title = "Bold text", inline = "strong" , selector = "img" },
                    new { title = "Red text", inline = "span", selector = "img", styles = new { color = "#ff0000" } },
                    new { title = "Red header", block = "h1", selector = "img", styles = new { color = "#ff0000" } });


Here is the screenshot of the dialog box. (Clicking on the Border Style will not provide any items as a dropdown) --> https://1drv.ms/u/s!Ao3_PEzak8vNlTnS-uxrFZ7cvzb9

Note: I am working on CMS --->

(I could not upload an image to this question because, even in this Episerver forum's TinyMCE image upload not works. It has no place to upload or select a file other than typing the source after clicking on the image icon. Screenshot --> https://1drv.ms/u/s!Ao3_PEzak8vNlThleoJia5q_ZCXV )

Edited, Jun 12, 2018 8:33
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