Draw into Interactive Render Region

On 04/10/2013 at 05:23, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R13+ 
Platform:   Windows  ;   Mac OSX  ; 
Language(s) :     C++  ;

I see that C4D itself can draw tool information into the Interactive Render Region, but I cannot.  As soon as the mouse enters it, the tool draw disappears or, in the case of a selection region around the cursor, it freezes at the edge.  How can this be done?