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
{
			if ( DesignChoiceConstants.PARAM_CONTROL_CHECK_BOX.equals( controlType ) )
			{
				if ( isValidValue( defaultValue ) != null )
				{
					defaultValue = null;
					defaultValueChooser.select( 0 );
				}
				else
				{
					if ( Boolean.valueOf( defaultValue ).booleanValue( ) )
					{
						defaultValueChooser.select( 1 );
					}
					else
					{
						defaultValueChooser.select( 2 );
					}
				}
			}
			else if ( DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( controlType ) )
			{
				if ( getSelectedDataType( ).equals( DesignChoiceConstants.PARAM_TYPE_STRING ) )
				{
					if ( defaultValue == null )
					{
						defaultValueChooser.select( 0 );
					}
					else if ( defaultValue.equals( "" ) )
					{