How to display sort numbers if you sort a grid by several columns

Note:
This solution requires the component to be installed first.
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Introduction
The solution demonstrates how you can sort iGrid.NET by several columns and mark sorted columns by numerated sort icons.
Detail
You can sort iGrid.NET by several columns when you click the required column headers while holding down a control key (Ctrl, Alt or Shift). When you do so, iGrid.NET marks the sorted columns by numerated sort icons, and you do not need to do anything special for that. No code is required - it is the default behavior of iGrid.NET.
You can see a screenshot of how it looks here:

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