Binding Grid.RowDefinitions / Grid.ColumnDefinitions

[DM-3]

Trying to bind the RowDefinitions and ColumnDefinitions properties of a grid to ViewModel class gives error AVLN3000.
Binding other properties of the same object works as intended.
Is it intentional that these properties cannot be bound?

axaml snippet in question:

<Grid
    RowDefinitions="{Binding GridRows}"
    ColumnDefinitions="{Binding GridColumns}"
/>

cs snippet in question:

public RowDefinitions GridRows { get; } = new RowDefinitions();
public ColumnDefinitions GridColumns { get; } = new ColumnDefinitions();

[stevemonaco]

The binding system requires you to bind target properties that are StyledProperty or DirectProperty. Grid.RowDefinitions is a normal CLR property. Similar to WPF, it's not designed to be binded to and mutating can be difficult. I tend to use Grid as a fixed table layout, although not fixed cell size. However, that's not strictly the case if you're mutating in code-behind.