As per the Grid’s internal architecture, when you change the DataSource in a key press event, it makes the Grid reload to ensure the current cell ends its focus. To type continuously in the filter bar cell while the DataSource is changing, there should be workaround as follows.
When you want to maintain the focus on the filter bar cell while changing the data source on the key press event, you need to get the location and the text of the filter bar cell by using the TableControlCurrentCellKeyPress event. After changing the data source, you need to move the focus to the same filter bar cell, so that the focus is maintained on the same cell.
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