Bug 144378 There is no checkbox for user to bind a dynamic image
Description: Create a dynamic image, there is no checkbox for user to bind the column of dataset. Steps to reproduce: 1.Create a sample datasource and dataset with "select * from CLASSICMODELS.PRODUCTLINES". 2.Add a image to the report layout, select dynamic image type, and then click "Binding" button, select the dataset, and want to bind a column. But there is no checkbox for user to do this action. Expected result: Like data item, there is a checkbox for user to bind the column.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
}
			return true;
		}
		public Object getValue( Object element, String property )
		{
			if ( element == dummyChoice )
			{
				ComputedColumn column = StructureFactory.newComputedColumn( inputElement,
						DEFAULT_COLUMN_NAME );
				column.setExpression( "" ); 
				String groupType = DEUtil.getGroupControlType( inputElement );
				if ( ExpressionUtil.hasAggregation( column.getExpression( ) ) )
				{
					if ( groupType.equals( DEUtil.TYPE_GROUP_GROUP ) )
						column.setAggregateOn( ( (GroupHandle) DEUtil.getGroups( inputElement )
								.get( 0 ) ).getName( ) );
					else if ( groupType.equals( DEUtil.TYPE_GROUP_LISTING ) )
						column.setAggregateOn( null );
				}
				if ( !ExpressionUtil.hasAggregation( column.getExpression( ) )
						|| groupType.equals( DEUtil.TYPE_GROUP_NONE ) )
				{
					column.setAggregateOn( null );
				}
				addBinding( column );
				highLightName = column.getName( );
				return ""; 
			}
			ComputedColumnHandle handle = ( (ComputedColumnHandle) element );
			String value = null;