"button" | "sprite-button" | "checkbox" | "flow" | "frame" | "label" | "line" | "progressbar" | "table" | "textfield" | "radiobutton" | "sprite" | "scroll-pane" | "drop-down" | "list-box" | "camera" | "choose-elem-button" | "text-box" | "slider" | "minimap" | "entity-preview" | "empty-widget" | "tabbed-pane" | "tab" | "switch"