repaints the component
webix.ui({
container:"box",
view:"form",
elements:[
{ view:"button", id:"b1", value:"Edit", css:"webix_primary" },
{ view:"button", id:"b2", value:"Back", css:"webix_primary" }
]
});
...
$$("b1").define("value","Save");
$$("b1").refresh(); // value:"Edit" -> value:"Save"