Bug 142430 Available data set should be invisible for dynamic image
Steps to reproduce: 1.New a sample data source and data set with table "PRODUCTLINES" 2.Add a dynamic image, binding with data set 3.Click "Expression Builder" Expected result: Available data set is not listed in Category to avoid user choose it Actual result: Available data set is listed in Category but we didn't support such expression like dataSetRow["image"]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
complete = ( embeddedImageList.getSelectionCount( ) > 0 );
				
				break;
			case FILE_TYPE :
				complete = !StringUtil.isBlank( uriEditor.getText( ) );
				previewButton.setEnabled( complete );
				break;
		}
		getOkButton( ).setEnabled( complete );
	}
	private void openExpression( )
	{
		ExpressionBuilder expressionBuilder = new ExpressionBuilder( uriEditor.getText( ) );
		
		
		
		
		unionDataSets( );
		ExpressionProvider provider = new BindingExpressionProvider( inputImage );
		expressionBuilder.setExpressionProvier( provider );
		
		if ( expressionBuilder.open( ) == OK )
		{
			uriEditor.setText( expressionBuilder.getResult( ) );
		}
	}
	private void openBidingDialog( )
	{
		CommandStack stack = SessionHandleAdapter.getInstance( )
				.getCommandStack( );