Hi Andre,
Setting DefaultLineSize via Xaml is not possible, but we can acheive this by using attached property.
1.Create the attached property as follows.
[C#]
public static readonly DependencyProperty RowHeightProperty = DependencyProperty.RegisterAttached(
"RowHeight", typeof(double), typeof(A) ,new FrameworkPropertyMetadata(32.0, OnRowHeightsChanged));
2.Set this property in the xaml like below.
[Xaml]
x:Name="dataGrid"
AutoPopulateColumns="True"
AutoPopulateRelations="False"
local:A.RowHeight="200">
3.Use the following code in OnRowHeightsChanged.
[C#]
var datagrid = d as GridDataControl;
datagrid.Model.RowHeights.DefaultLineSize =(double) args.NewValue ;
Download the workarond sample under the following location.
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=GDCAttachedProperty1186167042.zip
Please let us know if you need any more details.
Thanks
Ganesan