Error while evaluating Axes ButtonDownFcn

Im trying to making a ButtonDownFcn for one of my axes in a gui created in GUIDE. But due to my lack of knowledge I dont know which input arguments to use.

Main Code:

function hgui = saxsgui(varargin)
xyChildren = get(gui.xy_axes,'Children');
rthChildren = get(gui.rth_axes,'Children');
xyChildren.HitTest = 'off';
rthChildren.HitTest = 'off';
gui.rth_axes.ButtonDownFcn = {@zoomon_click};
gui.xy_axes.ButtonDownFcn = {@zoomon_click};

%The function for ButtonDownFcn.

function zoomon_click(handles, gui) %hObject,
%callback for zoom shortcut
% handles = guidata(hObject);

menu = findobj('Label','Zoom');
menu = findobj(menu,'tag','MenuViewZoom');
% set(gui.zoomoff_button,'Visible','on')
state = 'on';
zoom(gui.figure, state)
togglemenu(menu)
% guidata(hObject,handles);

Error message:

No appropriate method, property, or field 'figure' for class 'matlab.graphics.eventdata.Hit'.
Error while evaluating Axes ButtonDownFcn

[Geoff Hayes]

Nikolaj - I don't understand your saxsgui function. You pass in a variable number of arguments but don't try to use anything and instead reference something called gui. How was this passed in to your function? This same function also returns (has an output parameter) hgui but this is never initialized. What is this for? Perhaps show how you call saxsgui from your main code.

As for the zoomon_click callback, the two input parameters are not the handles structure or the gui (?) but the handle to the source/object that caused the callback to fire (so the object that the callback is attached to) and some event data (if any exists). The signature should look more like

 function zoomon_click(hObject, eventdata)

If you wish to pass additional parameters to this function (like the figure or GUI handle), then you would do this when you assign the callback

 gui.rth_axes.ButtonDownFcn = {@zoomon_click, hGui};

and youd callback signature would become

 function zoomon_click(hObject, eventdata, hGui)

The trick will be to pass the GUI handle into your saxsgui function...

[Dennis]

is a callback function so your first 2 function inputs are passed by Matlab, namely hObject and event. Try to change it to

function zoomon_click(hObj,~,handles,gui)

It seems like you are using gui to pass handles instead of handles, maybe you can omit one of those.

edit: you need to change your callback to

{@zoomon_click,gui}

[Nikolaj Daniel]

Thank you for the quick anwser... Im not able to try your sugestions right now but will do it later.

The part with saxsgui isen´t that important right now. I have skipped alot of coding so only what im working with right now is showned as i diden't knew if it was needed.

EDIT: It worked as a charm. Thank you Geoff and Dennis for your answers