static/ext/src/ux/TreePicker.js
function() {
        var me = this,
            picker;

        if (me.isExpanded) {
            picker = me.getPicker();
            if (me.matchFieldWidth) {
                // Auto the height (it will be constrained by max height)
                picker.setWidth(me.bodyEl.getWidth());
            }
            if (picker.isFloating()) {
                me.doAlign();
            }
        }
    }
function() {
        var me = this,
            picker;

        if (me.isExpanded) {
            picker = me.getPicker();
            if (me.matchFieldWidth) {
                // Auto the height (it will be constrained by max height)
                picker.setWidth(me.bodyEl.getWidth());
            }
            if (picker.isFloating()) {
                me.doAlign();
            }
        }
    }
Aligns the picker to the input element