UI problem with custom filtering and inherited filter

[Patrick]

Hello,
I'm defining custom filters that inherits from existing filters. In Silverlight, I have no problem with this, but in WPF, the custom filters doesn't show all the options the first time it is displayed.

For example, if I define my custom filter as:

Namespace OrdinaSoft.Windows.Controls;

Interface

  Uses
    System.Windows,

    Telerik.Windows.Controls,
    Telerik.Windows.Controls.GridView,
    Telerik.Windows.Data;

  Type
    FilteringControl Nested In osRadGridViewTextColumn = Private Sealed Class (
      Telerik.Windows.Controls.GridView.FilteringControl
    )

    Public

      Constructor;

      Method Prepare (Column : GridViewColumn); Override;

    End;

Implementation

  Constructor osRadGridViewTextColumn.FilteringControl;
  Begin
    Style := System.Windows.Style (Application.Current.Resources ['FilteringControlStyle'])
  End;

  Method osRadGridViewTextColumn.FilteringControl.Prepare (
    Column : GridViewColumn
  );
  Begin
    Inherited Prepare (Column);
  End;


End.

Actually, this filter does nothing, it just inherits from the Telerik one.
Now, when I click on the funnel, the first time, the filter only displays the combo boxes, as you can see in the enclosed screen shot.
The second time the filter is displayed, it contains all the items.

Patrick

[Yoan]

Hi Patrick,

You need to ensure that your filtering control has a constructor that accepts the column of the filtering control and calls the base constructor with this parameter:

public MyFilteringControl(Telerik.Windows.Controls.GridViewColumn column)
   : base(column)
   {

   }

And then create it by telling it which column it is designed for.

This will link the column and the filtering control from the very beginning and everything should work as though you were using the stock filtering control.


Regards,
Yoan
Telerik

[Patrick]

Hello Yoan,
thanks for the solution: it is working fine now!
But it should be interesting to update the documentation to have this information for other users.
Patrick

[Yoan]

Hello Patrick,

Thank you for the remark about our documentation. We will update it with that additional information.

Regards,
Yoan
Telerik