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The Docking control is using a RadGridResizer inside which inherits from the regular GridSplitter in order to resize its content. The explained behavior is the default GridSplitter behavior - it allows resizing by using the arrows when focused. However you can avoid that by inheriting our RadGridResizer and overriding the default KeyDown and KeyUp event handlers in the custom class. Afterwards you will need to replace everywhere RadGridResizer with the custom one in the used theme. For your convenience I have prepared and attached a sample project which demonstrates the exact approach.
Hope this helps.
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