That post is also wrong, RadListPicker does support null selection in Multiselect mode.
Regardless, here's my issue. Change the following two lines of code in your sample for ListPicker Multiselect.xaml.cs:
this.categoryListPicker.SelectedItems.Add(categoryItemsSource[0]);
this.categoryListPicker.SelectedItems.Add(categoryItemsSource[1]);
Make them this
this.categoryListPicker.SelectedItems.Add(categoryItemsSource[1]);
this.categoryListPicker.SelectedItems.Add(categorytemsSource[2]);
Now explain why your simple sample app selects three items when you havigate to the page. ListPicker always selects ItemsSource[0]. It also for some reason calls the SummaryForSelectedItemsDelegate twice on initialization. Just step your sample code.
4 Answers, 1 is accepted
The forum post below you refer to was created *before* the ListPicker support multiple selection and of time was writing was correct.
I checked the scenario you described and could not reproduce the issue you are reporting - the category list picker has two values selected.
I did however reproduced the fact that the summary delegate is called twice - we will investigate this further.
Can you please tell us what version of the assemblies you are using and if possible a sample project that we can investigate.
Valentin.Stoychev
the Telerik team
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Rank 1
I experienced this issue in my app, so I investigated and am able to recreate the problem in ExamplesCS_WP Multiselect.xaml.cs.
By changing the index of the items added to the categoryListPicker.SelectedItems to not include index 0, the control will automatically add index 0.
I've attached screen shots of the code changes and the app running with index 0 selected.
Rank 1
The SummaryDelegate is still called twice.
Thanks for the update. Yes, we will investigate the issue with the double calls to the summary delegate.
Please let us know if we can help with anything else.
Greetings,
Valentin.Stoychev
the Telerik team
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