Hide/Visible IWButton with template

[matija]

I have IWButton in my Form with RenderVisibility=true. 

This button i have defined in HTML template {%IWButton%}.

I want one time hide button in another time visible this button with Event.

IWButton.Visible:=false / IWButton.Visible:=true;

Change other property? Why not work?!

Set 
IWButton.StyleRenderOptions.RenderVisibility := True;
IWTemplateProcessorHTML.RenderStyles := True;

It should work

Thx this work, however now disregard property button in css btn btn-success ! 

How my button {%IWButton%} form format in HTML template with btn btn-success?