我做了一个GUI界面，想通过APPEND将左边的内容添加到右边，但是当我选中其中一项时，左边全部添加到了右边，而且 我又应该如何将右边选中项删除而不影响其他项。

function test_listbox( varargin )

if nargin == 0
    figureHandle = figure('Tag', 'MyFigure');
    uicontrol('Style', 'listbox', 'Tag', 'listbox1', 'Pos', [50 50 100 200], 'String', {'a','b','ccc','ddd','ee'});
    uicontrol('Style', 'listbox', 'Tag', 'listbox2', 'Pos', [300 50 100 200], 'String', {'ab','bc','ddd','sad','wd'});
    uicontrol('Style', 'pushbutton', 'Tag', 'button1', 'Pos',  [190 160 70 25], 'String', 'Append', 'Cal', 'test_listbox(''Append'', gcbo)');
    uicontrol('Style', 'pushbutton', 'Tag', 'button2', 'Pos',  [190 120 70 25], 'String', 'Delete', 'Cal', 'test_listbox(''Delete'', gcbo)');
   
    handles = guihandles(figureHandle);
    guidata(figureHandle,handles);
else
    feval(varargin{:});
end

function Append( h )

handles = guidata( h );

value1 = get(handles.listbox1, 'Value');
string1 = get(handles.listbox1, 'String');

value2 = get(handles.listbox2, 'Value');
string2 = get(handles.listbox2, 'String');

string2{end+1} = string1{value1};

set(handles.listbox2, 'String', string2);

function Delete( h )

handles = guidata( h );

value = get(handles.listbox2, 'Value');
string = get(handles.listbox2, 'String');
string(value) = [];

set(handles.listbox2, 'String', string);

非常感谢

程序里好像有个新问题，当删除右边listbox中最后一项时，listbox会消失

????