Check for modifiers when WindowScrollWheelFcn is called

Hi all,

I was wondering if it possible to check if a user has a modifier key (i.e. ctrl or alt) pressed when the WindowScrollWheelFcn is called on a figure?

I want to assign two different behaviours to the WindowScrollWheelFcn depending on whether or not a specific key is pressed.

Here's some pseudo code, to give the general idea what I want.

 function fWindowScrollWheelFcn(hObject, eventdata)
        modifiers = get(gcf,'currentModifier');
        ctrlIsPressed = ismember('control',modifiers);

        if ctrIsPressed
            % Behaviour #1
        else
            % Behaviour #2
        end
    end

When I try this, the get function returns an empty cell array.

Thanks!

Ricardo