# 2020 v1

## Content



### CollectionView

**Breaking changes**

*   Removed C1.CollectionView (using C1.DataCollection instead).

### Core

**Bug fixes**

*   Fixed the issue where Null Reference exception occurred on navigating controller while grid cell tapped with cells of last row.

### FlexViewer

**Bug fixes**

*   Fixed the issue where System.ArgumentOutOfRange Exception occurs when closing document after searching text in FlexViewer.
*   Fixed the issue where pages are shown left-aligned in FlexViewer when setting 'Actual Size/Whole Page' zoom-mode.
*   Fixed the issue where selection highlights do not match with search results starting form second page of document.
*   Fixed the issue where correct page is not navigated by entering page number in PageNumber-box when setting 'PageDisplayMode' more than one page.
*   Fixed the issue where images do not appear when setting 'RotateMode' property as 'Rotation90Clockwise' or 'Rotation90CounterClockwise'.
*   Fixed the issue where images are not rotated properly after navigating pages when setting 'RotateMode' property at design-time.
*   Fixed the issue where pages are cut off when setting '0' at 'left/right' values in 'Padding' property of FlexViewer.
*   Fixed the issue where System.ArgumentOutOfRange Exception occurs when closing document after searching text in FlexViewer.
*   Fixed the issue where pages are not applied with customized themes and background color is still not applied after navigating pages.
*   Fixed the issue where background color is not applied on setting 'BackgroundColor' property in FlexViewer.

**Improvements**

*   Support Dark/Light theme based on Dark/Light OS mode.
*   Add RotationMode property.
*   Add ShowPrintDialog method
*   Add Printing Feature.
*   Add Export menu item.
*   Add Rotate left/right menu items

### Gauge

Bug fixes

*   Fixed the issue where backgroundColor of Gauge is not transparent to visible an image when gauge is added on top of an image.