将“加载动画PictureBox”面板放置在选项卡式布局窗格的顶部

To solve the positioning problem you can use either of the following options:

1. Run-Time Solution: Create your PictureBox at run-time
2. Design-Time Solution: Use Document Outline Window to position control

Run-Time Solution

You can simply create PictureBox at run-time and add it to Controls collection of the Form and when needed, simply bring it to from using BringToFront method.

Design-Time Solution

You can use Document Outline window to change parent of the controls and their z-index. You can simply drag and drop tree nodes (controls) to change parent and z-index of the control.

举例来说，创建一个新表单Form，放置一个Panelon表单并将其设置Dock为Fill。然后PictureBox在面板上放置一个。然后在树状视图中使用“文档大纲”窗口，PictureBox将其拖动并在树状视图中将其置于面板节点中。这样，您可以将Form设置为的父级PictureBox。要将图片框移动到窗体上的适当位置，请使用箭头键或使用“属性”窗口。不要使用鼠标，如果使用鼠标更改位置，则会意外更改父对象。