Matlab 2015 vs Matlab 2013. Using the Dwork vector to pass axes handles (now graphics objects)

In Matlab 2013 the command axes provided a double. It would appear that in Matlab 2015 the commands 'axes' of 'gca' provide the user with an object. Ok.

Prior to upgrading to Matlab 2015 I was using an sfunction that makes use of the Dwork vector i.e. I have been using the PostPropagationSetup method as follows;

    function DoPostPropSetup (block)
    block.NumDworks             = 1;
    block.Dwork(1).Name         = 'fighandle';
    block.Dwork(1).Dimensions   = 1;
    block.Dwork(1).DatatypeID   = 0;
    block.Dwork(1).Complexity   = 'Real';

Within the Start function - Start(block) the axes handle is captured. I currently store the axes handle in the Dwork vector like so

    set (h_figure, ...
    'NumberTitle', 'off', ...
    'Name', 'aircraft animation', ...
    'BackingStore','off', ...
    'MenuBar', 'figure', ...
    'Position', [10 42 500 500]);
     h_axes = axes; 
     block.Dwork(1).Data = h_axes;

The difficult I now have is that in Matlab 2015 the call to 'axes' now returns an object, not a double. Unfortunately the datatypeID of block.Dwork(1).Data must be one of the following

-1 for 'inherited',

0 for 'double',

1 for 'single',

2 for 'int8',

3 for 'uint8',

4 for 'int16',

5 for 'uint16',

6 for 'int32',

7 for 'uint32',

8 for 'boolean"

Any suggestions would be appreciated!

Regards,

Oliver