Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/TreeViewerDescription.java
IValidator validator, IConverter converter) {
		addColumn(instanceType, columnIndex,propertyName,null,validator,converter);
	}
	
	
	/**
	 * @param instanceType 
	 * @param propertyName
	 * @param validator
	 * @param converter
	 */
	public void addColumn(Class instanceType, String propertyName,
			IValidator validator, IConverter converter) {	
		addColumn(instanceType, -1,propertyName,validator,converter);
	}
	/**
	 * @param instanceType 
	 * @param propertyName
	 */
	public void addColumn(Class instanceType, String propertyName) {
		addColumn(instanceType, -1, propertyName, null, null, null);
	}
	
	/**
	 * @param instanceType 
	 * @param columnIndex
	 * @param propertyName
	 */
	public void addColumn(Class instanceType, int columnIndex, String propertyName) {
		addColumn(instanceType, columnIndex, propertyName, null, null, null);