Questions on UI for WPF Forum

9 answers

594 views

Unhandled Exception: Telerik.Windows.Automation.Peers.GridViewGroupPanelAutomationPeer.GetChildrenCore()

Hello,

The application I am working on is throwing the following unhandled exception whenever I attempt to run my automation against it. This issue started occurring when we upgraded our Telerik libraries from Library v2012.3.1129.40 to v2012.1.326.402. We are using HP QTP to automate our testing. This is the first time I have experienced this error, there were no issues prior to the Telerik lib upgrade.

System.NullReferenceException was unhandled by user code

Message=Object reference not set to an instance of an object.

Source=Telerik.Windows.Controls.GridView

StackTrace:

at Telerik.Windows.Automation.Peers.GridViewGroupPanelAutomationPeer.GetChildrenCore() in c:\TB\102\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Automation\GridViewGroupPanelAutomationPeer.cs:line 44

at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()

at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)

at System.Windows.Automation.Peers.AutomationPeer.UpdateChildren()

at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()

at System.Windows.Automation.Peers.AutomationPeer.UpdatePeer(Object arg)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at MS.Internal.Threading.ExceptionFilterHelper

I have located some backwards compatibility documentation on your website http://www.telerik.com/help/wpf/radgridview-backward-compatibility.html.

It explains that the “Telerik.Windows.Controls.GridView.Automation” class is now obsolete and has been moved into “Telerik.Windows.Automation.Peers…” class. Could this have something to do with my issue? Any help with this would be much appreciated.

GridView

answered on 23 May 2019

1 answer

231 views

Button is not working on popup inside RadGridView CellEditTemplate

<telerik:RadGridView ... NewRowPosition="Top">

<telerik:RadGridView.Columns>

<telerik:GridViewToggleRowDetailsColumn .../>

<telerik:GridViewDataColumn ...>

<telerik:GridViewDataColumn.CellTemplate>

<DataTemplate>

...

</DataTemplate>

</telerik:GridViewDataColumn.CellTemplate>

<telerik:GridViewDataColumn.CellEditTemplate>

<DataTemplate>

<TextBox ... >

<TextBox.Triggers>

<EventTrigger RoutedEvent="TextBox.GotFocus">

<EventTrigger.Actions>

<BeginStoryboard>

<Storyboard>

<BooleanAnimationUsingKeyFrames

Storyboard.TargetName="TextBoxPopup"

Storyboard.TargetProperty="IsOpen">

<DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />

</BooleanAnimationUsingKeyFrames>

</Storyboard>

</BeginStoryboard>

</EventTrigger.Actions>

</EventTrigger>

</TextBox.Triggers>

</TextBox>

<Popup x:Name="TextBoxPopup" ...>

...

<Button Content="Test Button"

Command=

"{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadGridView}},Path=DataContext.SaveCommand}"

Click="Button_Click"/>

<Popup.Triggers>

<EventTrigger RoutedEvent="Popup.LostFocus">

<BeginStoryboard>

<Storyboard>

<BooleanAnimationUsingKeyFrames

Storyboard.TargetName="TextBoxPopup"

Storyboard.TargetProperty="IsOpen">

<DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="False" />

</BooleanAnimationUsingKeyFrames>

</Storyboard>

</BeginStoryboard>

</EventTrigger>

</Popup.Triggers>

</Popup>

</DataTemplate>

</telerik:GridViewDataColumn.CellEditTemplate>

</telerik:GridViewDataColumn>

</telerik:RadGridView.Columns>

<telerik:RadGridView.RowDetailsTemplate>

...

</telerik:RadGridView.RowDetailsTemplate>

</telerik:RadGridView>

Hi,

In xaml, I have a button inside a popup that is placed on edit cell template (CellEditTemplate). The button's Click event and the Command are not fired when I click the button. I have tried placing the popup with the button inside view cell template (CellTemplate) and the button by itself (no popup) inside edit template. They are both working. The xaml structure is attached. When the button on the popup is clicked, I want to close the popup and proceed to commit the change on the cell. Is this possible to do?

Thank you in advance for your help.

GridView

answered on 22 May 2019

1 answer

107 views

[Solved] Autohide Collums when resize the application

Hi,

i was wondering if its possible to Autohide Collums in the GridView when i resize the application. For example: i resize the width of the application from full sreen to half so from 8 collums only 4 are now visible.

Best regards,

Thomas

GridView

answered on 21 May 2019

8 answers

363 views

Empty row validation tooltip

Hello,

I use a RadGridView and validate my data by implementing the INotifyDataErrorInfo interface.
It works well, but when there is a validation error, the tooltip of the row header is empty.
Could you please tell me how to fill the tooltip of the row header with the validation error messages?

Example: https://file.io/rEm4Fd (link valid until Tuesday 16th of April 2019)

GridView

answered on 21 May 2019

1 answer

127 views

Hello,

Given <telerik:GridViewDataColumn DataMemberBinding="{Binding Number, StringFormat=C}" />..
If I use GetValueForItem, I get the formatted value (e.g. $1.00)..
Is there a method so I can get "1" instead?

Thank you,

Jan

GridView

answered on 21 May 2019

6 answers

415 views

Automation Crash

Using Windows Narrator (or our automated testing tool) our app crashes with the following stack trace:

at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)

at System.Collections.Generic.List`1.AddRange(IEnumerable`1 collection)

at Telerik.Windows.Controls.RadTabControlAutomationPeer.GetChildrenCore()

at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()

at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)

at System.Windows.Automation.Peers.ItemsControlAutomationPeer.UpdateChildren()

at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()

at System.Windows.ContextLayoutManager.fireAutomationEvents()

This didnt happen with the Telerik trial dll's (version 2012.2.0725.40) but does happen since we received our licensed dll's (versions 2012.2.0912.40 and 2012.2.0929.40)

I would have raised this as a support ticket but my Telerik account isnt linked to our license at present.

Thanks

TabControl

answered on 20 May 2019

8 answers

1.2K+ views

Multiple selection with data binding in RadGridView

Hello,

I am trying to implement multiple selection of a RadGridView in an MVVM context with data binding, based on this example.

I have achieved one way of interaction: when the selection state in the grid view is changed, the SelectedItems property of the view model is changed accordingly.

However, when I try to update the view from the viewmodels state, I run into a loop, where a change in the view changes the view model, which tries to update the view again etc. as a consequence, WPF throws an exception, that a change of a collection inside a CollectionChanged event is not possible (which makes sense).

Any ideas how this is solved properly ? Unfortunately, the above mentioned example does not present any further details for this issue.

Lars

GridView

answered on 20 May 2019

1 answer

91 views

Combine RestoredTilesToSpanMultipleRowsAndColumns with Maximize functionality?

I have a case where I want some tiles to span multiple columns and different rows, so I implemented the RestoredTilesToSpanMultipleRowsAndColumns example that is frequently posted here (https://github.com/telerik/xaml-sdk/tree/master/TileView/RestoredTilesToSpanMultipleRowsAndColumns). However, after implementing it I see that the maximize button no longer works - the example sets MaximizeMode to "Zero" because it doesn't do anything. How can I restore that functionality?

TileView

answered on 20 May 2019

3 answers

146 views

TreeLinesVisibility not working with HierarchyColumnIndex

I get a visual bug when I use 'HierarchyColumnIndex' to set the 3rd column as the one I want the Tree to appear on and also turn on 'TreeLinesVisibility'

I looks like the tree lines say on the the first column and don't move over to the 'HierarchyColumnIndex' column like the tree arrows do

TreeListView

answered on 20 May 2019

8 answers

262 views

Styling for RadTimePicker

Hi

In the Rad Time Picker control, using the Windows 7 theme, the time entries in the picker popup is WHITE in color.
Can you please suggest as to how one can change the color to Black.

I tried using the foreground attribute, it didnot work.

<

telerik:RadTimePicker MinWidth="200" telerik:StyleManager.Theme="Windows7Theme" Foreground="Black" Tag="EndTime" Width="200" Grid.Row="4" Grid.Column="4" SelectedTime="{Binding Path=EndTime, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}"/>

Can you please suggest how one can achieve this.

Thanks and Regards
Abhinav

TimePicker

answered on 20 May 2019