@Box in a text flow

[Moray Taylor]

Hi,

I  want to draw a box behind a line of text in a flow like this

 blah blah blah
 blah blah blah
 blah blah blah
---------------------
|    heading    |
---------------------
 blah blah blah
 blah blah blah
 blah blah blah

When I attempt to do this, it draws the box around the whole text object.

I am using @place and @Wide/@High to position my text box, I can't put a 
seperate box behind the text, as I don't know where the text will be, is 
this possible?

Thanks in advance

Moray