Drop Down of RadComboBox is Going to the Top Left Corner of the Screen

[Ric]

Hi,

I hit the captioned issue that Drop Down of RadComboBox is Going to the Top Left Corner of the Screen.
It's does not happen all the time, but sometimes it does happen.

Is there any way to solve this?

Thanks
Ric Yik

[Konstantina]

Hello Ric,

Could you please give us some more details about the issue - in which version of the control this can be observed, how it can be reproduced, and everything that will help us track down the source of the problem.

Looking forward to your reply.

Regards,
Konstantina
the Telerik team

[Josh]

Hello Kostantina,

11 Years later I have the same problem. 

For your reference, this application was built months ago, the application runs over Windows 10 and Windows 11. We have Winforms 2021.15.0.225.

2 Weeks ago, this started to happen over all the dropdowns on the application, the first time that you click on the dropdown, it shows the drop-down list under the correct position, and the next time shows on the top left corner.

I saw some comments on the MSDN forums related that the information should be loaded on the focus or the loading time because when filling the dropdown on the click event, that could cause the issue.

In our case, we are loading the dropdowns on the loading time of the form. So, there is no relationship here with the MSDN forums.

The issue happens on single-screen computers and also, multi-screen.

We tried different Screen resolutions, change font sizing, etc and nothing makes any difference.

Something that I notice is that the users that have this issue are connecting Remote Desktop to a Windows 10 or Windows 11 computer.

I don't know if running directly the application this issue is happening. At least the users didn't notify us yet.

Also, if a Mac user connects with Remote Desktop, that doesn't happen.

 

Do you think is related to a Windows problem or something that we could help to avoid on the code side?

[Stenly]

Hello Josh,

May I ask, which Telerik product are you currently using, with which the unwanted behavior is present? Is it Telerik UI for WPF or Telerik UI for WinForms?

[Ric]

Hi,

Not sure if this information is useful. But our application runs on more than 1 monitor.

If we cannot reproduce this problem finally, do you think it's possible to write some code which force the position of the combo to be recalculated such that it will fit into the expected position again?

Thanks
Ric Yik

[Konstantina]

Hello Ric Yik,

Initially, the ComboBox is positioning the DropDown according to its place, so there should be any dislocations. We will need to reproduce the issue, in order to provide a fix.
Instead of the 2 monitors, do you use something different - are you applying any custom styles to the ComboBox?

All the best,
Konstantina
the Telerik team