since you're coding the uitable instead of using GUIDE you do not have the handles structure. you already have the handles for the uitable assigned to t.
so you just need to go get(t,'data').
the tag works differently when not using GUIDE as it is not also the same name as the GUI item. since you manually assign it to t you should know what item you're referring to. the tag is useful if you need to search for it but right now i cannot get a good instance when you need to. but to find the handles of the uitable if you do not have it you can find it by using the line findall(0,'tag','Tabla1')
