I have one xamgrid in which i have textcolumn.I want to make it readonly depending on whether grid is in Edit mode or Viewmode.

I have viewmodel and it is not possible to have parameterless constructor in this viewmodel.so we can not use static resource for this.

i have one property called as ReadonlyMode in viewmodel which i want to bind to this textcolumn.

But on xamgrid the itemsource which is bound is collection of table from database.

So i can't place my property inside this collection.We are entity framework for getting data.

How can we do this?I tried to use relativesouce in my binding but it doesn't work.

<ig:XamGrid x:Name="InstanceGrid"
AutoGenerateColumns="False"
ItemsSource="{Binding PackageTemplateTrees, Mode=TwoWay}">

 <ig:XamGrid.Columns>

<ig:TextColumn HeaderText="Name"
HeaderTextHorizontalAlignment="Center"
Key="Name"
Width="Auto"
IsReadOnly="{Binding EditMode,Mode=TwoWay, Source={RelativeSource AncestorType=UserControl,Mode=FindAncestor}}"
MinimumWidth="150">

</ig:XamGrid.Columns>
</ig:XamGrid>