Questions on UI for WPF Forum

3 answers

94 views

I switched my solution from using references to the binaries i have localy to nuget packages.

But by doing this i get a strange behaviour in the controls UI. Suddenly all controls get different theming than they had before the nuget packages.

How do i fix this so they are again showing as it was before?

General Discussions

answered on 28 May 2019

4 answers

624 views

Password protected Excel document

A password protected Excel document causes an error message "End of central Directory not found".

Would it be possible to get a more appropriate error message at least? The possibility to enter a Password would be great, of course.

Thanks

Michael

Spreadsheet

answered on 28 May 2019

9 answers

318 views

TileList Data Binding - MVVM

I am looking to set the ItemsSource of the TileList to an ObservableCollection of object. One property of this object will respresent a SizeMode which I would like to see setup as a Setter to set the TileType property. I have created an IValueConverter to convert this INT size property to the Telerik TileType enum, and setup a binding for this, however it is looking for this property on my window ViewModel, not a property of each bound item.

In the online documentation this is achieved by implementing an AutoGeneratingTile event handler in the code behind.

Could you please provide an example of how this is achieved.

Thanks

Duncan

TileList

answered on 27 May 2019

0 answers

964 views

WPF MATERIAL DESIGN LISTBOX - HELP

Hi Guys

I really desperately need your help on this. I have created listbox with a toggle from materialdesign theme package and along with richtextbox. The listbox comprises of three listboxitems which are bold, italic and underline. So when the user clicks on the button and the highlighted text in the richtextbox will reflect its changes accordingly, i.e. normal font text changes to font bold.

However what I have noticed the listboxitem with button like format has to be double clicked in order to get the font text to change from bold to normal, vice versa from normal to bold. I have been struggling on how to get the single click selection and the button to show the selected highlight colour etc.

I couldn't use the event setter as it messes the highlight colour and styling of the listboxitems

PLEASE HELP - the code behind is C#

General Discussions

asked on 25 May 2019

3 answers

101 views

Server Page Sort Group Filter Demo

Hello,

I have the local WPF RadControls demos installed on my machine, but I cannot view the Server Page Sort Group Filter demo, the app crashes and closes everytime. Is there a newer version of the demo that I can install? Or, perhaps some other documentation about how to wire up the DataGridView, and a DataPager in this way.

What I am wondering specifically is if something like that demo will work using a WCF DataService instead of linq to sql, since the DataService will not allow Group By, or Select? All that I really need is the paging, can these controls help me out with 'lazy loading' through a DataService one page at a time?

Thanks.

GridView

answered on 24 May 2019

1 answer

205 views

show or hide DataFormDataField inside a NewItemTemplate

Hi,

I have a Gender DataFormComboBoxField in the RadDataForm's NewItemTemplate. How do I show and hide another DataFormDataField on the same template(NewItemTemplate) based on the Gender type (male/female)?

Thanks!

DataForm

answered on 24 May 2019

1 answer

139 views

The PasswordBox clears it's entry on a Windows session reconnect

Steps to reproduce:

I have built a wpf application with 2 telerik controls: a WatermarkTextBox and a PasswordBox.

1. In a Windows session, I launch my wpf application

2. Enter text in both controls

3. Leave the application up and running and disconnect from the Windows session

4. I reconnect to (log back in) the Windows session, the PasswordBox field gets cleared.

[In a different scenario, when having multiple WatermarkTextBox, some of the WatermarkTextBox get cleared when reconnecting to the session]

Any idea what is going? I did some research and could not find anything helpful. Thanks.

PasswordBox

answered on 23 May 2019

1 answer

321 views

Convert to Telerik WPF Application option is missing

Hello!

I recently purchased Telerik UI For WPF. Installation worked fine, dll's are installed in the GAC etc.

However, I can't convert my existing project into a Telerik WPF Application. The option is missing from the Telerik menu in VS for 1 of my projects, and is not present in the Context menu in the Solution explorer either.

My VS solution exists of 10 or so projects. For 9 of those projects, the Convert to Telerik WPF application is there, but for the main application which I want to convert the option is missing as I described.

Any ideas?

Tia,

Chris

Installer and Visual Studio Extensions

answered on 23 May 2019

2 answers

367 views

RadGridView, custom filter date with dynamic columns

Hi, i'm trying to implement a custom filter as your example, but in a dynamic columns grid, when i filter i receive this error:

'The binary operator GreaterThanOrEqual is not defined for the types 'System.Object' and 'System.DateTime'.'

On the event

private void OnFilter(object sender, RoutedEventArgs e)

{

this.fromFilter.Value = this.FromDate;

this.toFilter.Value = this.ToDate;

if (!this.column.DataControl.FilterDescriptors.Contains(this.compositeFilter))

{

this.column.DataControl.FilterDescriptors.Add(this.compositeFilter);

}

this.IsActive = true;

}

i set the dynamic column type like this:

e.Column.ColumnGroupName = "Commercial";

e.Column.Header = new TextBlock { Text = "Data inserimento", TextAlignment = TextAlignment.Center, TextWrapping = TextWrapping.Wrap, Width = 75, LayoutTransform = new RotateTransform { Angle = -90 } };

((GridViewDataColumn)(e.Column)).DataFormatString = "{0:dd-MMM-yy}";

((GridViewDataColumn)(e.Column)).DataType = typeof(DateTime?);

((GridViewDataColumn)(e.Column)).FilterMemberType = typeof(DateTime?);

e.Column.FilteringControl = new ucDateFilter { FromDate = DateTime.Now, ToDate =DateTime.Now.AddDays(5)};

GridView

answered on 23 May 2019

9 answers

579 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