How to dynamically add RowDefinition or ColumnDefinition to a Grid with binding?

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You can use attached properties for a Grid that modify the RowDefinitions and ColumnDefinitions when those properties are set or changed.

It will allow you to write your Grid like this:

<Grid local:GridHelpers.RowCount="{Binding MaxGridRow}"
      local:GridHelpers.ColumnCount="3" />

Then just expose a property from your ViewModel which returns the largest row number in the Cells collection.

You can find a detailed implementation of those properties on my blog.

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