In the GridGroupingControl, when you change the height of a particular row, it affects the height of all the rows. You need a custom engine to resolve this problem. The custom engine is used to avoid the problem by passing the row index in the RowHeight property. In the GridModel, height of a single row is changed by using the GridEngineFactory class before invoking the InitializeComponent method.
By using GridModel
In the QueryRowHeight event, there is no engine needed to set the height of a single row because by default it supports the height change of a particular row.
By using QueryRowheight
After applying the properties, the row looks like the following screenshot
Figure 1: Changing the row height
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