Basically the idea is to get the data from treepanels loader which comes from some dataUrl.
I`m trying to make DragZone.getDragData to return the someProperty value from json data.
Code:
loader: new Ext.tree.TreeLoader({
            dataUrl:'tree-data.json'
}),
and this is the json:
Code:
[{
    text:'Basic Ext Layouts',
    expanded: true,
    children:[{
        text:'Absolute',
        someProperty:'someText',
        id:'absolute',
        leaf:true
    },{
        text:'Accordion',
        someProperty:'someOtherText',
        id:'accordion',
        leaf:true
    },{....