Pretty simple to recreate. Drop a panel, rounded corners extender and a text box on a form. Set the required properties to apply the rounded corners extender to the panel. In your code behind, lets say the page load event handler, throw in a this.SetFocus(this.TextBox1);.
When the page loads you see the text box has focus until the rounded corners get applied to the panel at which point in time the text box loses focus.
This previously fixed issue (Item # 9690) does not work now in version 11119.
When the page loads you see the text box has focus until the rounded corners get applied to the panel at which point in time the text box loses focus.
This previously fixed issue (Item # 9690) does not work now in version 11119.