In SfDataGrid, the group represents the collection of records that belong to a particular category. While grouping a column, the details about the group is displayed in CaptionSummaryRow like Group name, Group Key, ItemsCount. Click to know more about Grouping.
In SfDataGrid, each group has a level property. For example, when you initially group a column, more groups are created and the group level is considered as 1 for those groups. When you group another column, the group level is considered as 2 for newly created groups. Likewise, the group levels are maintained for all the groups.
In the following code examples, the CaptionSummaryRow background is changed based on the group level by using CaptionsummaryRowStyleSelector.
You can apply the above styles to CaptionSummaryRow based on the grouping level by using CaptionSummaryRowStyleSelector as shown in the following code example.
Here, CustomCaptionSummaryStyleSelector class is derived from StyleSelector and the SelectStyle method is overridden. For WinRT, the SelectStyleCore method is overridden, and styles are returned based on the group level. In the SelectStyle method, you can get the DataRowBase from the argument item and from the DataRowBase, you can get the group level and apply the style based on the group level.
You can refer the following code example to apply the customized style to CaptionSummaryRow.
In the following screenshot, CaptionSummaryRow background has been changed based on the group level.
Figure 1: CaptionSummaryRow style changed based on group levels
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