I have a project which created by seam-gen.
And I have problem with binding. Any component doesn't work with it.

For example, I'll show problem with a4j:commandButton. In my bean I have this code:

import org.ajax4jsf.component.html.HtmlAjaxCommandButton;
HtmlAjaxCommandButton myButton;

...

    public HtmlAjaxCommandButton getMyButton(){
        if(myButton == null)
            myButton = new HtmlAjaxCommandButton();
        return myButton;
    }

    public void setMyButton(HtmlAjaxCommandButton myButton){
        this.myButton = myButton;
    }
...

And in the xhtml when I want use binding for a4j:commandButton I add this only:

...
binding="#{accounting.myButton}"
...

I expected that is can work but I give an exception:

object is not an instance of declaring class

This situation with any component. Not whith a4j:commandButton only.
Is anybody have ideas what is it?