SizeMode="Fill" for Xamarin.Forms datagrid column to fill the space left
e.g.
<radDataGrid:DataGridDateColumn PropertyName="Date" SizeMode="Fixed" Width="80" />
<radDataGrid:DataGridTextColumn PropertyName="Title" SizeMode="Fill" />
<radDataGrid:DataGridNumericalColumn PropertyName="Score" SizeMode="Auto" />
=>
First column has width 80, 3rd column has width of content (already working)
NEW: Second column occupies the space left