mediaobject that will display as a block

I'm hoping to keep a <mediaobject> and <title/caption> on the same page in the FO output to pdf.
Using Oxygenxml v13 with Saxon6.5.5 with Apache FOP.

Have tried <mediaobject> and <informalobject> without success as some of the <title/caption> flows to the next page. 

How can I avoid this?

I have 

<mediaobject>

   <imageobject>

     <imagedata/>

     <title/caption/>
   </imageobject>

</mediaobject>

that I want to keep together on the same page when transformed to pdf.

Simply what I getting at the end of a pdf is the following:

<imagedata/>

page-break

<caption/>

and I want to avoid the break in between.

I have also added the formal.object.properties parameter to the list in Oxygenxml, as it was not listed - to no avail.

With thanks

Paul