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 ( DISPLAY_NAME_CONTROL_LIST.equals( displayText ) )
		{
			return PARAM_CONTROL_LIST;
		}
		return CONTROL_TYPE_CHOICE_SET.findChoiceByDisplayName( displayText )
				.getName( );
	}
	private void changeDataType( )
	{
		String type = getSelectedDataType( );
		if ( type.equals( lastDataType ) )
		{
			return;
		}
		if ( buildControlTypeList( type ) )
		{
			changeControlType( );
		}
		lastDataType = type;
		if ( type.equals( DesignChoiceConstants.PARAM_TYPE_STRING ) )
		{
			clearDefaultValueChooser( isRequired.getSelection( ) );
		}
		else if ( !type.equals( DesignChoiceConstants.PARAM_TYPE_BOOLEAN ) )
		{
			clearDefaultValueText( );
			clearDefaultValueChooserSelections( );
		}
		initFormatField( );
		if ( isStatic( ) )