static/ext/src/ux/TreePicker.js
function() {
        var style = this.picker.getView().getEl().dom.style;

        // can't use Element.repaint because it contains a setTimeout, which results in a flicker effect
        style.display = style.display;
    }
function() {
        var style = this.picker.getView().getEl().dom.style;

        // can't use Element.repaint because it contains a setTimeout, which results in a flicker effect
        style.display = style.display;
    }
repaints the tree view