在c# WPF中，为什么我的TabControl的选择更改事件频繁触发?

I have a tabbed GUI with each tab containing a Frame. In one of these Frames there is a DataGrid. When the user selects this tab, I need my datagrid sorted, so I'm using the TabControl SelectionChanged event to trigger the sort. However, this event triggers every time an item is selected from the DataGrid, even though the tabs themselves remain untouched.I have a tabbed GUI with each tab containing a