Bug 190727 [regression]Default value issue when switch report parameter from textbox to listbox.[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
}
				else
				{
					inputParameter.setLabelExpr( getExpression( displayTextChooser.getText( ) ) );
				}
			}
			
			inputParameter.setHelpText( UIUtil.convertToModelString( helpTextEditor.getText( ),
					false ) );
			
			inputParameter.setCategory( formatCategroy );
			inputParameter.setPattern( formatPattern );
			if ( isStatic( )
					&& ( PARAM_CONTROL_COMBO.equals( getSelectedControlType( ) ) || DesignChoiceConstants.PARAM_CONTROL_RADIO_BUTTON.equals( getSelectedControlType( ) ) )
					&& !containValue( null, defaultValue, COLUMN_VALUE ) )
			{
				defaultValue = null;
			}
			
			if ( dirtyProperties.containsKey( CHECKBOX_HIDDEN ) )
			{
				inputParameter.setHidden( getProperty( CHECKBOX_HIDDEN ) );
			}
			if ( dirtyProperties.containsKey( CHECKBOX_ISREQUIRED ) )
			{
				inputParameter.setIsRequired( getProperty( CHECKBOX_ISREQUIRED ) );
			}
			if ( doNotEcho.isEnabled( ) )
			{
				if ( dirtyProperties.containsKey( CHECKBOX_DO_NOT_ECHO ) )