I use Height="*" a bit to mean that the height of the last row should fill to the bottom of the grid.
But what does "10*" mean?
<Grid Name="mainGrid">
<Grid.RowDefinitions>
<RowDefinition Height="100" />
<RowDefinition Height="40" />
<RowDefinition Height="10*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
</Grid>
"*"
is shorthand for "1*"
. It's a ratio, so if you have two rows, one with "*"
and one with "10*"
, the former gets 1/11th of the available and the latter gets 10/11th of the space.
In your example above, "10*"
is unnecessary - "*"
would make more sense because there is only one row using ratio-based sizing, so any ratio will equate to 100% of the available space.