Draw order

The draw order of elements in the visual treeAn object graph, made of lightweight nodes, that holds all the elements in a window or panel. It defines every UI you build with the UI Toolkit.
See in Glossary follows a depth-first search. Child visual elementsA node of a visual tree that instantiates or derives from the C# VisualElement class. You can style the look, define the behaviour, and display it on screen as part of the UI. More info
See in Glossary appear on top of parent elements. UI Toolkit draws child elements in the order of the sibling list. The draw order is the following:

1. 顶级视觉元素。
2. 该视觉元素的第一个子元素。
3. 后代元素的子元素。

The diagram below shows the draw order of a visual tree:

To change the draw order of visual elements in C#, use the following functions:

• BringToFront()
• SendToBack()

To change the draw order of sibling visual elements, use the following functions:

• PlaceBehind()
• PlaceInFront()