src/org/tiefaces/components/websheet/utility/ParserUtility.java
public static boolean isWidgetMethodString(final String str) {
		if (str == null) {
			return false;
		}
		return str.startsWith(TieConstants.METHOD_WIDGET_PREFIX);
	}
public static boolean isWidgetMethodString(final String str) {
		if (str == null) {
			return false;
		}
		return str.startsWith(TieConstants.METHOD_WIDGET_PREFIX);
	}
widget method start with $widget. e.g. $widget.calendar{....

@param str
the str
@return true, if is widget method string