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get(eventd​ata.NewVal​ue,'Tag') ===>>> Error ??? Attempt to reference field of non-structure array.

Hello, ¿somebody knows what is happening?
I can´t get the Selected data from a button group panel:
function uipanel8_SelectionChangeFcn(hObject, eventdata, handles)
Seleccion=get(eventdata.NewValue,'Tag')
It gives me the Error:
??? Attempt to reference field of non-structure array.
Error in ==> Leitungsseilen>uipanel8_SelectionChangeFcn at 878
Seleccion=get(eventdata.NewValue,'Tag')
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> Leitungsseilen at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==> hgfeval at 65
evalin('base', fcn);
Error in ==> uitools.uibuttongroup.childAddedCbk>manageButtons
at 80
hgfeval(cbk, source, evdata);
??? Error while evaluating uicontrol Callback
I appreciate your help,
David

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 채택된 답변

I think that the reasson is for being a GUIDE GUI... it does not accept eventdata.NewValue
Instead of that I have used... get(hObject,'Tag') and this way it works.

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Daniel Shub 님의 답변 30 Apr 2012

I am pretty sure that NewValue is not a typical field of the eventdata for a gui callback. Have you overloaded eventdata? Are you sure you do not want handles.NewValue, although that seems odd to me also.

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Hi Daniel,
handles.NewValue gives me the error:
??? Reference to non-existent field 'NewValue'.
I think that the reasson is for being a GUIDE GUI... it does not accept eventdata.NewValue
Instead of that I have used... get(hObject,'Tag')
and this way it works.
Thank anyway for your help!,
David
Please post this as an answer and accept it.
For clarification to future readers of this post, the .NewValue field IS standard for certain ui components like button groups. To the original poster, I've come across problems using button groups correctly as well. I have noticed that a UI component (like a radio button) won't be handled by the button group's 'SelectionChangeFcn' if it has its own callback defined.

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