GridViewComboBoxColumn Binding

[Lou]

I have a form with a RadGrid control that has its ItemSource set to a collection in my View Model, and it all works

I need to add a GridViewComboBoxColum  to the Grid.   The source will be another collection in the same View Model.

Sounds simple, right?   But I can’t get the ComboBox to appear.

For the examples below:

_vm is a public window variable that is a reference to my View Model.
valuestatus is the collection of values that I want to display in the dropdown.

WL_Dashboard is the class type of the list that is set in theitem source of the grid.

 

<telerik:GridViewComboBoxColumn Name="ValStatusColumn" Header="Val.Status"
   SelectedValueMemberPath="{Binding Path=ValidationStatus, Mode=TwoWay}"
   IsReadOnly="False"
   HeaderCellStyle="{StaticResource BlueHeaderCellStyle}"
   ItemsSource="{Binding _vm.valuestatus}"
   DisplayMemberPath="valstatus">

</telerik:GridViewComboBoxColumn>

 

 

This does not generate an exception or an error in the output window – but the dropdown does not display

 

If I replace ItemsSource with ItemSourceBinding:

it generates a bunch of errors in the output window and the dropdown does not display:

System.Windows.Data Error: 40 : BindingExpression path error: '_vm' property not found on 'object' ''WL_Dashboard' (HashCode=55939488)'. BindingExpression:Path=_vm._valuestatus; DataItem='WL_Dashboard' (HashCode=55939488); target element is 'RadComboBox' (Name=''); target property is 'ItemsSource' (type 'IEnumerable')

 

The documentation doesn't help me much because there is no itemsSource set on the grid.  It sounds like if use ItemSourceBinding that I need to override the WL_Dashboard setting on the grid for this column - but how?

 

Any idea what I'm doing wrong?  Gotta be something simple that I'm missing here...

 

Thanks in advance for any assistance you can provide.
Lou

[Martin Ivanov]

The binding seems correct, however, note that in order for the data binding to get evaluated properly, the bound property of the view model should be a property (not a field) and also it should have public getter and/or setter. If "_vm._valuestatus" is not defined as a property, the binding won't work. Double check this on your side and see if this helps. If not, can you share few additional code snippets showing your models?