winforms - javascript bounded cant change form object visible false -

i changed cefsharp winforms example.

it bound callback. browser.registerjsobject("bound", new browserform()); bound browserform can access java call addtab java

i called c# methods javascript via bound.

my problem cant hide image object when calling java. button on form can do.

c# code

public void load_successfull()     {         messagebox.show("working good.");         loading_animation.visible = false;      }

private void button2_click(object sender, eventargs e) { load_successfull(); }

java code: bound.load_successfull();

when called java cant hide loading_animation

Ben