[CLOSED] Button Icon

[bbros]

Hello!
I need to draw a flag icon in a button in order to show the selected language.
The button is in _Header.cshtml, so I don't have codebehind.
I would like to set it via javascript.

The following code works fine:

      <ext-button id="LanguageButton"
                    variant="Light"
                    scale="Medium"
                    text=""
                    hidden="false"
                    icon="/images/flag_italy.png"
                    margin="5"
                    onClientClick="">
            <menu>
                <ext-menu plain="true">
                    <items>
                        <ext-menuItem id="LangItMenuItem" text="Italiano" icon="/images/flag_italy.png">
                            <listeners>
                                <click handler="alert('Italiano!');" />
                            </listeners>
                        </ext-menuItem>
                        <ext-menuItem id="LangEnMenuItem" text="English" icon="/images/flag_usa.png">
                            <listeners>
                                <click handler="alert('English!');" />
                            </listeners>
                        </ext-menuItem>
                    </items>
                </ext-menu>
            </menu>
        </ext-button>

I would like to create a js which reads inside a cookie the preferred language and sets the correct icon to the LanguageButton.

App.LanguageButton.setIcon('...') or App.LanguageButton.icon = '...' do not work;
I tried to use the iconCls but it becomes white (maybe because of a wrong implementation).

.bbros-flag-it {
    background:url(/images/flag_italy.png);
}

Could you please help me?
Thank you much!