Have each listbox's callback call the same function, say GetColumnD() or whatever. Then in there, (untested code)
function itemFromColumnD = GetColumnD(handles, excelTable)
itemFromColumnD = []; % Initialize to null
% Get the item number that they selected.
selected1 = get(handles.listbox1, 'value')
selected2 = get(handles.listbox2, 'value')
selected3 = get(handles.listbox3, 'value')
% Get the contents (optional - just FYI in case you want to inspect)
items1 = get(handles.listbox1, 'String')
items2 = get(handles.listbox2, 'String')
items3 = get(handles.listbox3, 'String')
% Get the selected item (optional - just FYI in case you want to inspect)
selectedItem1 = items1{selected1};
selectedItem2 = items1{selected2};
selectedItem3 = items1{selected3};
% Now compare
if selected1 == selected2 && selected1 == selected3
% All indexes are the same so extract column D at that row.
itemFromColumnD = excelTable{selected1, 4};
end
Of course you need to make this more robust to handle things like selected is empty because they didn't have anything selected, use try/catch, etc.
