cmenu=uicontextmenu; 
hline=plot(1:10,'UIContextMenu',cmenu);
cb1=['set(hline,"LineStyle","--")'];
cb2=['set(hline,"LineStyle",":")'];
cb3=['set(hline,"LineStyle","-")'];
item1=uimenu(cmenu,'Label','dash','Callback',cb1);
item2=uimenu(cmenu,'Label','dotted','Callback',cb2);
item3=uimenu(cmenu,'Label','solid','Callback',cb3);

运行后有画面，但是菜单的效果无法实现，并出现以下的提示
??? Error: Missing variable or function.
??? Error while evaluating uicontrol Callback.
不知道问题出在哪里 ？？？  [em18]