How to use the ext/panels/panels.unregister function in ext

destroy : function(){
        this.stop();
        panels.unregister(this);
        this.$destroy();
    }
});

destroy : function(){
        commands.removeCommandByName("openfilepanel");
        
        this.nodes.each(function(item){
            item.destroy(true, true);
        });
        this.nodes = [];
        
        panels.unregister(this);
    },
});

destroy : function(){
        commands.removeCommandByName("opentreepanel");
        panels.unregister(this);
        this.$destroy();
    }
});

destroy : function(){
        commands.removeCommandByName("opensettingspanel");
        panels.unregister(this);
        this.$destroy();
    }
});

destroy : function(){
        this.hbox.destroy(true, true);
        //this.splitter.destroy(true, true);
        panels.unregister(this);
    }
});

destroy : function(){
        commands.removeCommandsByName(["run", "stop"]);
        panels.unregister(this);
        this.$destroy();
    }
});

destroy : function(){
        commands.removeCommandByName("opensettingspanel");
        
        this.nodes.each(function(item){
            item.destroy(true, true);
        });
        this.nodes = [];
        
        panels.unregister(this);
    }
});

destroy : function(){
        winDocViewer.destroy(true, true);
        panels.unregister(this);
    }
});

destroy : function(){
        this.nodes.each(function(item){
            item.destroy(true, true);
        });
        this.nodes = [];
        
        panels.unregister(this);
    }
});

destroy : function(){
        commands.removeCommandByName("openfilepanel");

        this.nodes.each(function(item){
            item.destroy(true, true);
        });
        this.nodes = [];

        panels.unregister(this);
    },
});