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/internal/ui/editors/schematic/tools/ReportCreationTool.java
* Constructor
	 * 
	 * @param factory
	 * @param preHandle
	 */
	public ReportCreationTool( CreationFactory factory,
			AbstractToolHandleExtends preHandle )
	{
		super( factory );
		this.preHandle = preHandle;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.tools.CreationTool#performCreation(int)
	 */
	protected void performCreation( int button )
	{
		isCreating = true;
		SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( )
				.getCommandStack( )
				.startTrans( MODEL_CREATE_ELEMENT_TRANS );
		if ( getTargetEditPart( ) != null )
		{
			if ( preHandle != null )
			{
				preHandle.setRequest( this.getCreateRequest( ) );
				preHandle.setTargetEditPart( getTargetEditPart( ) );
				Command command = getCurrentCommand( );