If CustomDto is an object with a property on it that has the text you want to show then your column would look something like this.

<ig:TextColumn Key="CustomDto.PropertyWhereTextValueIs" HeaderText="Description"></ig:TextColumn

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It's not clear on what you are asking.

If you have a collection you would set it to the .ItemSource of the grid and as long as you have AutoGenerateColumns set to true (the default value) you should see a column for each public property off the data object.

The Header text of that column will be the name of the property.  So in your case I would expect to see a column called Name, Id, and CustomDto.

Now if you want to change the header text, off the column object is a HeaderText property, which can be set up in Xaml very easily with Xaml similar to this.

="false">

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It didn't fix my problem. Please see the text in bold

ObservableCollection<Myclass>. where MyClass has properties

Name,Id and CustomDto.

I want to bind this ObservableCollection to the grid where  I will have 3 columns for Name , Id and

Description where the description from my CustomDto.

3rd column of the grid is Description which is the property of CustomDto