Bug 136256 Enhance the message builder
Please see the spec attached in 133995 for detail.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/TextDataEditPart.java
protected boolean hasText( )
	{
		if ( StringUtil.isBlank( ( (TextDataHandle) getModel( ) ).getValueExpr( ) ) )
		{
			return false;
		}
		return true;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
	 */
	protected IFigure createFigure( )
	{
		TextFigure text = new TextFigure( );
		return text;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.editparts.ReportElementEditPart#refreshFigure()
	 */
	public void refreshFigure( )
	{
		super.refreshFigure( );
		( (LabelFigure) getFigure( ) ).setToolTipText( ( (TextDataHandle) getModel( ) ).getValueExpr( ) );
	}
}