customize

redefines the "item" property

Example

myDiagram = webix.ui({
    view:"diagram",
    // ...
    item: {
      type: "plus"
    }
});
 
myDiagram.customize({ type: "rrect" });
myDiagram.refresh();

Remember, the method does not force repainting of the component. That is why after calling the customize() method you should call the refresh or render method methods to apply the newly-specified value

To change any component property (not the "item" one) - use define method.