# Animation

The **ExpandAnimation** and **CollapseAnimation** tags of **RadTreeView** are used to customize the way groups are expanded and collapsed. For each expand or collapse animation, you can specify **Type** and **Duration**:

* The **Type** is chosen from a list of predefined animation effects:

  * Linear

  * InQuad

  * OutQuad

  * InOutQuad

  * InCubic

  * OutCubic

  * InOutCubic

  * InQuart

  * OutQuart

  * InOutQuart

  * InQuint

  * OutQuint

  * InOutQuint

  * InSine

  * OutSine

  * InOutSine

  * InExpo

  * OutExpo

  * InOutExpo

  * InBack

  * OutBack

  * InOutBack

  * InBounce

  * OutBounce

  * InOutBounce

  * InElastic

  * OutElastic

  * InOutElastic

* The **Duration** is set in milliseconds and describes the amount of time to animate the expanding or collapsing of the **RadTreeView**.

To disable expand animation effects, set the **Type** to **AnimationType.None**.