Buttons in popup can not be pressed when I put my UserControl in DataGridCell.

### Description

The xaml code structure is like belows.
```

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1. When I set Popup's property IsOpen equals True as initial value, "Button_Click" will be triggered, the opposite is not triggered.
2. When I put MyUserControl not in DataGridCell template, "Button_Click" will be triggered, the opposite is not triggered.
3. When I put Grid in DataGridCell template and not in MyUserControl, "Button_Click" will be triggered, the opposite is not triggered.
I want to know how it happened, and what if I code like above, how can I trigger "Button_Click". Thank you.

### Reproduction Steps

```

```
Code like aboves.

### Expected behavior

I want to know how it happened, and what if I code like above, how can I trigger "Button_Click".

### Actual behavior

1. When I set Popup's property IsOpen equals True as initial value, "Button_Click" will be triggered, the opposite is not triggered.
2. When I put MyUserControl not in DataGridCell template, "Button_Click" will be triggered, the opposite is not triggered.
3. When I put Grid in DataGridCell template and not in MyUserControl, "Button_Click" will be triggered, the opposite is not triggered.

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_