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
{
						ExceptionHandler.handle( e1 );
					}
				}
			}
		} );
	}
	private void isRequiredChange( boolean isRequired )
	{
		if ( getSelectedDataType( ).equals( DesignChoiceConstants.PARAM_TYPE_STRING ) )
		{
			clearDefaultValueChooser( isRequired );
		}
	}
	private void clearDefaultValueChooser( boolean isChecked )
	{
		if ( isChecked )
		{
			clearDefaultValueText( );
			clearDefaultValueChooserSelections( );
		}
		else
		{
			if ( defaultValueChooser.getItemCount( ) > 0 )
				return;
			defaultValueChooser.add( CHOICE_NULL_VALUE );
			defaultValueChooser.add( CHOICE_BLANK_VALUE );
		}
	}
	private void createLabel( Composite parent, String content, int width )