I've created a panel with its own view model/controller that I've linked to another form (by drag and drop in Sencha Architect 3.2). How do I go about binding values from the view model of the parent form so that the linked panel can see them? I don't even know where to begin tackling this one. Here's my linked component config on the parent form:

Code:
{
    xtype: 'fieldset',
    layout: 'auto',
    title: 'Submit to Supervisor',
    items: [
        {
            xtype: 'approvalpanel', // this is the userAlias of the linked component
            width: 450
        }
    ]
}
I need the get the value of a field from a linked model instance of the parent form, from within the 'approvalpanel' and use that value to change the URL of a store's proxy.