view.selModel is undefined with locked column

[Oliver Specht]

Hi,
I am trying to implement a locking column in a grid but get an error in FF:

TypeError: view.selModel is undefined

When debugging, I can see that the error comes up in Ext.grid.plugin.Editing and view does contain two more views with selection models set: normalView and lockedView.

I tried the examples and they work fine, so I wonder where this comes from. I simply set the first column to locked:true and the others to locked:false

The grid looks like this:

Ext.define('My.grid.Panel', {
    extend : 'Ext.grid.Panel',
    alias : 'my.grid.panel',
    autoHeight : true,
    selModel : Ext.create('Ext.selection.RowModel', {
        singleSelect : true
    }),
    resizable : false,
    frame : false,
    plugins : [ {
        ptype : 'rowediting',
        clicksToEdit : 2,
        pluginId : 'rowediting',
        listeners : {
            canceledit : function(editor, e, eOpts) {
                e.grid.store.removeAt(0);
            }
        }
    } ],
    tbar : [ {
        text : 'Add'
    } ],
    listeners : {
        activate : function(grid) {
            grid.store.load();
        }
    },
    viewConfig : {
        stripeRows : true
    }
});

Can anyone give me a hint what I am doing wrong?

I am working with ExtJS 4.1.1a, so maybe it is just a version too early?

Thank you,
Oliver