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This event is fired before a column is resized.

Fired by RadTreeList
Arguments get_column() - returns a reference to the clicked TreeListColumn object
get_domEvent() - returns the DOM event that was raised for the current event
Can be canceled Yes


function ColumnResizing(sender, eventArgs) {
    alert("Resizng column with Index: " + eventArgs.get_column().get_element().cellIndex + ", width: " + eventArgs.get_column().get_element().offsetWidth);
// OR
function ColumnResizing(sender, eventArgs) {
    eventArgs.set_cancel(true) //cancel ColumnResizing event

See Also