Bug 183900 Image in preview pane will not show until you reopen the "Edit Image Item" dialogue [0001]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
{
			String columnExpr = DEUtil.getColumnExpression( (String) dialog.getResult( ) );
			uriEditor.setText( columnExpr );
		}
		else
		{
			if ( inputImage.getDataSet( ) == null )
			{
				uriEditor.setText( "" );
			}
		}
	}
	private java.util.List unionDataSets( )
	{
		dataSetList = new ArrayList( inputDataSetList );
		if ( inputImage == null || inputImage.getDataSet( ) == null )
		{
			return dataSetList;
		}
		int i = inputDataSetList.indexOf( inputImage.getDataSet( ) );
		if ( i == -1 )
		{
			dataSetList.add( inputImage.getDataSet( ) );
		}
		return dataSetList;
	}
	private boolean checkExtensions( String fileName )
	{
		for ( int i = 0; i < IMAGE_TYPES.length; i++ )
		{