title: Is there a way to hide/disable the `Close` button on a `bsModal` window?
body: <p>A <code>bsModal</code> window in <code>shiny</code> app comes with a default <code>Close</code> button. Is there a way that can be disabled? I tried to look up on SO for similar questions, but didn't find one matching my requirements. I think, if a user can close the window using the top right corner <code>X</code> button, there is not really a need for another <code>Close</code> button. Please advise. Following reproducible code will generate a sample <code>bsModal</code> window to understand my question.</p>
  
  <pre><code>library(shiny)
  library(shinyBS)
  
  if(interactive()){
    shinyApp(
      ui &lt;- fluidPage(
        actionButton("open", "Open"), #action button to trigger the modal window.
        bsModal("id1", "Box 1", "open", size = "small",
                HTML(paste("A simple modal window."))
                )
        ),
  
      server &lt;- function(input,output,session){
  
      }
    )
  }
  </code></pre>