How to make EDIT button visible false in D365Fo Form

Hi All,

I created customized form in that I tried to hide the new, delete  and edit  (System button ) .

Using below code I can able to achieve NEW,DELETE button

public void init()
    {
        this.form().design().showNewButton(0);
        this.form().design().showDeleteButton(0);
        super();

    } 

Note: But I able to hide the EDIT button in my form I tried different way to resolved but I can't able to do it,

I tried below code but no luck, please help to hide the EDIT button

publicvoidinit()
    {
        #SysSystemDefinedButtons

        super();

        attachButton= this.control(this.controlId(#SystemDefinedAttachButton)) as FormCommandButtonControl;
        attachButton.visible(false);
    }