I tried to circumvent the ctrl modofier in such a way, that I look into the event's previous value and delete/save as necessary. Now, there is also always one option selected
I modified the callback as follows:
function selectionChanged(src,evt)
prevVal=evt.PreviousValue;
currVal=src.Value;
if strcmp(fig.SelectionType,'normal') % to preserve ctrl behavior
isThere=ismember(prevVal,currVal);
if any(isThere)
prevVal=prevVal(~isThere);
else
prevVal=[prevVal currVal];
end
src.Value=prevVal;
end
end
please note that with the current state, the bahavior with ctrl left click changes and does not work as intended anymore.
EDIT: edited code to properly preserve ctrl click behavior
