The Grid columns definition can be set only once - during widget initialization. If the Grid later on must show another data with different columns, you should destroy the Grid
, remove it from the DOM, add new <div> to the DOM and create a new Grid from it with new column definitions.
I strongly recommend you to avoid using Splitter pane elements to initialize another widgets. Please add a child element to the #right-pane and use that for the Grid.
the Telerik team
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