Event handler for COM ActiveX object (actxserver)

I am trying to write "event handler" to COM ActiveX object

>> h = actxserver ('ProgID'); >> h.registerevent({'DataReady' 'h_plot'});

%event handler function h_plot( varargin ) data = h.GetData; plot(data(1,:)) end

So I am getting an error as follows

Error using comeventcallback (line 34) Error firing event 'DataReady' to 'h_plot'.

Warning: Error occurred while evaluating listener callback.

How can I use a method of the COM Object within handler function? If I use (data = h.GetData;) out of event handler then it works...

Thanks. Peter

[Peter]

command window

>> h = actxserver ('ProgID');

>> h.registerevent({'DataReady' 'h_plot'});

%m-script

%event handler

function h_plot( varargin )

data = h.GetData;

plot(data(1,:))

end