Bug 177439 Need an easy way to determine default value for a dynamic parameter
Currently, I have to bring up the data set editor, preview the results in the data set and make a mental note of the value to use for a report parameter that depends on a data set. It would be nice to have a drop down on the default value field, such as <Select value> which when selected queries the data set and presents me with a list to select from.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
selectedParameter.setName( UIUtil.convertToModelString( paramNameEditor.getText( ),
					true ) );
			selectedParameter.setCategory( formatCategroy );
			selectedParameter.setPattern( formatPattern );
			refreshValueTable( );
		};
	}
	private boolean isSingle( )
	{
		return singleDataSet.getSelection( );
	}
	private ScalarParameterHandle getFirstParameter( )
	{
		if ( inputParameterGroup.getParameters( ).getCount( ) > 0 )
		{
			return (ScalarParameterHandle) inputParameterGroup.getParameters( )
					.get( 0 );
		}
		return newParameter;
	}
	private boolean checkParameter( ScalarParameterHandle paramHandle )
	{
		if ( paramHandle.getValueExpr( ) == null
				|| getColumnName( paramHandle, COLUMN_VALUE ) == null )
		{
			return false;
		}
		return true;
	}
}