Ext.grid.livegrid.CheckboxSelectionModel mouse and keyboard events called twice

How to Reproduce:
Load the Checkbox demo in the livegrid source and either click on a row or try moving up and down rows with the arrow keys. Moving up and down results in skipping a record each time and clicking with the mouse only allows certain actions to take place because mousedown and keyup are being called twice each time.

Problem:
Red text represents the problem and green text represents the added code to solve it.

Line 68 of Ext.grid.livegrid.CheckboxSelectionModel.js
Code:
initEvents : function()
    {   
        this.skipParentInitEvents = true;
        Ext.ux.grid.livegrid.CheckboxSelectionModel.superclass.initEvents.call(this);


        this.grid.view.on('reset', function(gridView, forceReload) {
                this.headerCheckbox = new Ext.Element(
                    gridView.getHeaderCell(this.grid.getColumnModel().getIndexById(this.id)).firstChild
                );
                if (this.markAll && forceReload === false) {
                    this.headerCheckbox.addClass('x-grid3-hd-checker-on');
                }
        }, this);


        Ext.grid.CheckboxSelectionModel.prototype.initEvents.call(this);
    },
and line 64 of Ext.grid.livegrid.RowSelectionModel.js
Code:
initEvents : function()
    {
        if(!this.skipParentInitEvents){
            Ext.ux.grid.livegrid.RowSelectionModel.superclass.initEvents.call(this);
        }


        var grid  = this.grid,
            view  = grid.view,
            store = grid.store;


        view.on('rowsinserted',    this.onAdd,            this);
        store.on('selectionsload', this.onSelectionsLoad, this);
        store.on('load',           this.onStoreLoad,      this);
    },
Because of these three superclass calls the Ext.ux.grid.livegrid.RowSelectionModel.superclass gets called twice resulting in Ext.grid.RowSelectionModel.initEvents being called twice and the mousedown and keyup events being doubled.

Solution:
By adding a flag for skipping the superclass initEvents, the CheckboxSelectionModel can still call both superclasses without worry of the double event hooks.