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    <p>You have to specify RowDefinitions and ColumnDefinitions so that it knows how to size the rows and columns. Otherwise it doesn't know whether you want auto-sizing or <a href="https://stackoverflow.com/a/2318082/674077">star-sizing</a>. And it also needs to know how many rows and columns you need up front; it doesn't add them on the fly based on your values of Grid.Row and Grid.Column.</p> <p>I think the code you wrote looks reasonable, and it would be nice if it used a default when you don't specify, but unfortunately it doesn't. Instead, it builds a single-column, single-row grid and stacks all the children on top of each other.</p> <p>I can think of a couple ways to write some XAML that will do what you want.</p> <p>One way:</p> <pre><code>&lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Rectangle Width="100" Height="100" Fill="Red" Grid.Column="0" Grid.Row="0"/&gt; &lt;Rectangle Width="100" Height="100" Fill="Orange" Grid.Column="1" Grid.Row="0"/&gt; ... &lt;/Grid&gt; </code></pre> <p>Another way:</p> <pre><code>&lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="100" /&gt; &lt;RowDefinition Height="100" /&gt; &lt;RowDefinition Height="100" /&gt; &lt;RowDefinition Height="100" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Rectangle Fill="Red" Grid.Column="0" Grid.Row="0"/&gt; &lt;Rectangle Fill="Orange" Grid.Column="1" Grid.Row="0"/&gt; ... &lt;/Grid&gt; </code></pre>
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    1. POWhy doesn't the grid layout work without specifying RowDefinitions and Column Definitions?
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    1. POWhy doesn't the grid layout work without specifying RowDefinitions and Column Definitions?
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    1. COso if i want to create a 4x2 grid, I need to provide 4 RowDefinitions and two column definitions ? Why have you only given three RowDefinitions ? 4th one is automatically arranged or what ? Is it possible for me to have table like structure where all the rows need not have same number of columns.
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      1. USAmogh Talpallikar
    2. COOops, my mistake. You do need four RowDefinitions, so I have edited my answer. Each row always has the same number of columns, but you can use Grid.ColumnSpan="2" on a rectangle to make it two columns wide (assuming you don't specify an explicit width on the rectangle). Similarly for Grid.RowSpan.
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    3. COThank you. Thanks a lot. I am fed up with every new GUI framework coming up with their own markup language and new layout rules.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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