There are two properties which can be used in conjunction to accomplish this.
One is the button's 'ButtonDownFcn' callback function. This callback function executes when pressing a mouse button on or near a UICONTROL object -- including when pressing the right mouse button.
The other property is the figure's 'SelectionType' property. This property indicates which kind of click was registered in the figure window -- including clicks on controls within the figure.
Putting these two together, you can define a 'ButtonDownFcn' callback for a push button which checks the figure's 'SelectionType' property to detect a right-click. An example is shown below. (In that example, the ANCESTOR function is used to get the figure's handle. If this is being done in a GUIDE-created GUI, this is unnecessary as the 'handles' structure already provides access to the figure's handle.)
function test
uicontrol('Style', 'pushbutton', ...
'ButtonDownFcn', @myCallback);
end
function myCallback(src, evt)
figHandle = ancestor(src, 'figure');
clickType = get(figHandle, 'SelectionType');
if strcmp(clickType, 'alt')
disp('right click action goes here!');
end
end
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