Bug 135497 Data Type is not correct when "Generate All" for Data item
Description: Create a sample datasource and dataset. Insert a data into layout, bind with the dataset.Click "Generate All" to get the Data Binding columns, but the displayed data type is not consistent with the actual one.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/actions/BaseInsertMenuAction.java
{
	protected static final String STACK_MSG_INSERT_ELEMENT = Messages.getString( "BaseInsertMenuAction.stackMsg.insertElement" ); 
	private String insertType;
	protected SlotHandle slotHandle;
	private Object model;
	/**
	 * The constructor.
	 * 
	 * @param part
	 *            parent workbench part
	 * @param type
	 *            insert element type
	 */
	public BaseInsertMenuAction( IWorkbenchPart part, String type )
	{
		super( part );