You can customize the dropdown height and width of the GridListControl cell by using the TableControlCurrentCellShowingDropDown event. In the given example, the size can be set for the dropdown based on the items count and its default height. Two columns are used here with the GridListControl cell type using QueryCellStyleInfo event and the sizes of those dropdowns have been changed within the TableControlCurrentCellShowingDropDown event.
The following screenshot displays customized GridListControl dropdown height.
Figure 1: Output
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