extjs 4 treepanel locked and expand

http://www.sencha.com/forum/showthread.php?136118-Locked-columns-on-a-tree-panel 

 

Locked columns on a tree panel

 

Hi,

If you take the treegrid example (ext/examples/tree/treegrid.js) and tell the first column to be locked, the sample no longer loads with the following error.

Uncaught TypeError: Cannot call method 'setRootNode' of undefined ext-all-debug.js:88047

Code:

columns: [{
       xtype: 'treecolumn', //this is so we know which column will show the tree
       text: 'Task',
       width: 150,
       sortable: true,
       dataIndex: 'task',
       locked:true
},{

Any ideas?

Thanks

It's not prepared to work with locked yet. Try this but don't trust it 

Code:

Ext.tree.Panel.override({
    isContainerPanel : function() {
        return !this.items || !!this.child('treepanel');
    },

    onRootChange: function(root) {
        if (!this.isContainerPanel()) {
            this.callOverridden(arguments);
        }
    },

    constructor: function(config) {
        config = config || {};
        
        this.enableAnimations = false;  // PATCH
        delete config.animate;
        
        this.callParent([config]);

        this.onRootChange(this.store.getRootNode());// PATCH
    }
});