I recently saw some XAML code that looked as follows:
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="5*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
Does this mean that the first and third columns will each consume 2/9 of the available space and the second column will consume 5/9?
Yes it is just a ratio of the total.