Most commonly the exception message is "Input file or data stream does not conform to the expected file format specification".
This appears because of the glyphs font used in the different controls.
To work this around you can use two approaches:
When focusing a Rad Controls like RadDateTimePicker, the watermark is hidden. This behavior could be very problematic when this field is the first of a form. The user will never see the watermark because the focus will be set in this field when entering in the form. It would be nice if the watermark could just be less visible by lowering its opacity. Additionaly, if the user erases the text, it would be nice too if the watermark could be showed at the same visible state than explained above.
Provide pdf version of documentation for UI for WPF
Please provide something like the new RelativePanel-Control from Windows 10 UWP for WPF. See: https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.controls.relativepanel.aspx
Currently, the design-time theme changer automatically removes previous references to Telerik themes. If the application has runtime theme change logic, the old theme references are needed and the developer needs to add them manually, which is annoying.
Add support for debugging Telerik UI for WPF using Intellitrace. https://blogs.msdn.microsoft.com/visualstudioalm/2015/01/16/intellitrace-in-visual-studio-ultimate-2015/
Hi, in your UI for WinForms Suite is a control called CheckedDropDownList. This control is just awesome so why it doesn't exists as WPF Version? Yesterday I was in need to create a close one with a AutoCompleteBox and a Button for drop down the list. But this isn't exactly what I need and it feels a bit...unperfect. So please create this great control for WPF! :)
Currently, each example depends on other project/files from the solution and they cannot be run separately. Implement a mechanism that allows downloading a runnable stand-alone version of each example.
Current SDK Sample code supports only WPF 40.
Adding support for wpf45 will make more convenient way to work with Samples.
Sample dode can include new wpf 45 features
When using OpenStreetMaps with APIKey (required for Cycle and Transport variations)
the key is not automatically passed to the builtin minimap and it shows 'Api Key Required' in some tiles.
In the current version of the WPF SDK Sample Browser Application it is really hard to track what's new and what control was updated. Even the version of Sample Browser by itself (2018.3) is not visible. Maybe you remember the former Sivlerlight Online Demos (I'm not sure if it is still around but I cannot run it anymore because it needs IE11)? There was always an updated or new badge on the controls. So it was obvious what was new and updated. I think this should be possible in WPF also. When hovering with the mouse over the control panels there shoud be more information shown like date of the last update of the sample. When clicking on a control on viewing the samples of the control, I can only open the folder, open in VS or run it. Sometimes it makes sense to open directly the sample on github to quickly check the version history.
Currently filtering with virtualized RadComboBox is not supported as the filtering feature works with the containers (changes their Visibility).