I could not find a good way for this. The only solution would be to click the textbox with code when the popup is opened:
sender, Telerik.WinControls.UI.FilterPopupInitializedEventArgs e)
var popup = e.FilterPopup
popup.PopupOpened += Popup_PopupOpened;
sender, EventArgs args)
var popup = sender
var textBox = popup.TextBoxMenuItem.HostedControl
Cursor.Position = popup.Location;
System.Runtime.InteropServices.HandleRef(popup, textBox.TextBoxElement.TextBoxItem.TextBoxControl.Handle), NativeMethods.WM_LBUTTONDOWN,0,0);
In addition, the textbox has correct size on my side. I have attached my test project. Could you please check it and let me know how it differs from your real setup?
I am looking forward to your reply.
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