How to add controls like TextBox in GroupDropArea?

In SfDataGrid, you can customize the GroupDropArea appearance like adding or replacing any control inside it by customizing its template.

By customizing the GroupDropArea template, a TextBox control is added inside the GroupDropArea. By using the GroupDropArea toggle button you can expand and collapse the GroupDropArea as well as the TextBox.

Refer to the following code example.

XAML

The following screenshot displays the TextBox control without grouping in GroupDropArea.

The following screenshot displays the TextBox control with Grouping in GroupDropArea.

You can refer to the sample from the following location to customize the style for GroupDropArea.

Sample: CustomizedGroupDropArea_WPF