Forms don't apply StartPosition property

Hi Jana,

Based on the test project that you have sent us, I assume that you are experiencing the issue, when running the project on HDPI setting. Can you confirm that, please? You can see the scaling of your system in Settings -> Display -> Scale section. 

If it is different than 100% then you are running on a scaled environment and I would recommend you to develop UI always using 100% DPI. Here is a nice article about that topic.

As it comes to your problem, I will ask you to try to reproduce it, without any scaling (at 100%) and see if it still appears to be broken.

I could not reproduce the issue at 100% on my machine, but I have managed to reproduce it at any kind of DPI scaling.

I have logged the issue on our ticket portal, where you can vote and subscribe for the issue, so you can track its status changes. Here is a link to the item.

I have also updated your Telerik Points.

In the mean time, I can offer you the following workaround of the problem:

    public partial class Popup : Telerik.WinControls.UI.RadForm
    {
        public Popup()
        {
            InitializeComponent();
            Load += Popup_Load;
        }

        private void Popup_Load(object sender, EventArgs e)
        {
            isLoaded = true;
        }

        private bool isLoaded = false;
        private bool isCentered = false;

        protected override void ScaleControl(SizeF factor, BoundsSpecified specified)
        {
            base.ScaleControl(factor, specified);
            if (StartPosition == System.Windows.Forms.FormStartPosition.CenterScreen && isLoaded && !isCentered)
            {
                CenterToScreen();
                isCentered = true;
            }
        }
    }

The main idea is to call CenterToScreen() method, after we scaled the form. the two variables IsLoaded and isCentered are used to guarantee that we call the CenterToScreen() method at the most appropriate time only once - after the form has loaded.

I hope this will solve your problem and if there is anything else that we can help with, do not hesitate to write back.

Regards,
Stoyan
Progress Telerik